In 2024, Unlocking Apple iPhone 14 Pro Passcode without a Computer

In 2024, Unlocking Apple iPhone 14 Pro Passcode without a Computer

Sophia Lv12

Unlocking Apple iPhone 14 Pro Passcode without a Computer

You can still utilize a PIN if your Apple iPhone 14 Pro’s Touch or Face ID is not working. Yet, consider the possibility that you may forget your Apple iPhone 14 Pro password too. So, how to unlock disabled iPhone without computer? Do you need to connect it to your PC, run iTunes, and follow the system? Not really.

Entering the wrong password a few times will lock your Apple iPhone 14 Pro. What you want to do right now is sidestep the password so you can begin using it again. Whether you have more up-to-date models like iPhone 14, or an older one like iPhone 4, some tools can help you.

Therefore, this guide explains how to unlock iPhone passcode without computer. In addition, this guide elaborates on the safest methods available in the market to help you secure your Apple iPhone 14 Pro. So, keep reading and find out about unlocking an iPhone without a computer.

Part 1: Can I Unlock My iPhone Passcode without Computer?

Yes, you can open the Apple iPhone 14 Pro password without needing a PC.

Moreover, there are more than a few simple methods for doing such. Also, you don’t need to bother with any technical information. Users can now unlock their iPhones through the Erase iPhone, Find My, and Siri. Even if these methods don’t work in your situation, you can employ other professional tools. One such tool is Dr.Fone.

Dr.Fone-Screen Unlock by Wondershare is an expert tool to remove such issues. It is a safe method for everyone new to the technical world. The process is basic, assuming you follow the step-by-step guide below.

Part 2: 3 Methods to Unlock Disabled iPhone without a computer?

1. “Erase iPhone” Option

You want to use this method when you fail to remember your Apple iPhone 14 Pro PIN. It is the most straightforward method for opening your Apple iPhone 14 Pro, assuming you forgot your password.

Since iOS 15.2, Apple presented an “Erase iPhone” choice from the Security Lockout window. This window appears from the seventh time you enter an incorrect code. The steps beneath work if your Apple iPhone 14 Pro or iPad runs iOS 15.2 or later and has an internet connection:

  • When you don’t know the lock screen PIN, please enter your password several times from your Lock Screen until it warns you the next time. Then do this step again until you see the Erase iPhone toward the side of the screen.
  • Tap Erase iPhone, then click again to affirm your action.

erase iphone

  • Enter your Apple account credentials to sign out of your Apple ID on the phone.
  • Tap Erase iPhone back to erase all your files and settings forever.
  • Right when the phone restarts, comply with the on-screen steps. Yet again, set your phone, and restore your information and settings from a backup. Presently set another password for your phone.

Guidelines to Restore a Locked iPhone Running iOS 15.1 or Earlier:

  • Regardless, put your Apple iPhone 14 Pro into DFU mode.
  • Then, connect it to a PC or Mac through a Lightning USB.
  • Tap your Apple iPhone 14 Pro in the Finder sidebar on Macintosh or iTunes on the PC.
  • Pick Restore when you see the decision to Restore. Let the download finish, and your phone leaves the recovery mode screen. Yet again, then switch off your Apple iPhone 14 Pro and begin.
  • Disconnect your iDevice, then turn it on and set it up. That is all you must do.

2. Use Find My

Apple permits clients to erase iPhone data to protect it from others remotely. Nonetheless, your lock screen can save your data if you don’t erase the Apple iPhone 14 Pro device. Nobody can open the screen except if they enter the right passcode. After too many incorrect attempts, your Apple iPhone 14 Pro will be locked. So nobody can then touch your data.

If you have enabled the “Find My” choice before failing to remember your Apple iPhone 14 Pro PIN, there is an opportunity for you to eliminate the lock. That is to use iCloud.

Prerequisites:

  • The locked device ought to have the Find My component enabled.
  • The locked iPhone ought to be signed in to your iCloud ID.
  • It ought to have an internet connection, be it data or Wi-Fi.
  • It will help if you remember your Apple ID credentials.

To open iPhone through iCloud:

Step 1. Visit the iCloud.com page and sign in with your Apple ID and password.

Step 2. Click the “Find iPhone” choice from the various accessible choices.

Step 3. Click “All Devices” and pick the gadget you want to open.

Step 4. Click the “Erase iPhone” button. In this manner, set up the phone and another lock screen PIN. With iCloud, you can open your iDevice without contacting your device.

use find my iphone

3. Use Siri (Only for iOS 8.0 to 10.1)

There is an issue with Siri that you can use how to unlock iPhone passcode without computer. This arrangement probably won’t work consistently, yet it deserves checking out. The bug works on any phone running on iOS 8 up to iOS 10.1

  • Initiate Siri on your iDevice. You should simply long press the Home button. Then, ask Siri what the time is, “Hello Siri, what time is it?”
  • Siri will then show you the time. There will be a clock symbol bordering it. Tap on the clock, and you can get to the World clock. Click on the “+” sign to add another watch.

add clock

  • You will get a bar where you have to enter a city. First, write anything to make sure you can write. Then, tap on the text and click “Select all” afterward.
  • You will now get new choices, including cut, copy, and so on. Tap on the “Share” button to proceed. You will get options for sharing the text. Click on the Message icon. Your device will open another window. Now, you begin drafting another message. Go to the “To” field, and type any text. Click back to proceed with opening an iPhone without a PC.
  • The text will become green. Yet again, now that your text is chosen, click on “+” to add a symbol. When you tap it, another window will open. Click on “Create new contact” to proceed. You will now see a window where you can add another contact. Tap on “Add Photo” to move.

create new contact

  • Click the “Select/Pick Photo” button to choose a photograph from your library. When the library opens, you can see the collections. Do not click anywhere. Wait for a couple of moments, and afterward, tap on the Home button. You will then access the Home screen. That’s how to unlock disabled iPhones without computer.

Bonus Tips: Easy App to Unlock Your Apple iPhone 14 Pro

Dr.Fone-Screen Unlock

We, as a whole, realize that expert software is the quickest and simplest method for opening an iPhone. These devices are helpfully intended to make life simpler; thus, they do.

Dr.Fone-Screen Unlock is a special tool that eliminates iPhone screen lock in minutes with no confusing steps. The team at Dr.Fone has years of insight into iPhone lock issues. Besides, it is developed, so any non-specialist with no technical information can use it. Here’s how to unlock disabled iPhone without computer:

Step 1. Plug the iDevice into your system

Run the Dr.Fone on your system and select the “Screen Unlock” option from the main menu.

select screen unlock

Use a connector to connect your Apple iPhone 14 Pro to the PC. After this, click the “Unlock iOS Screen” option on the program.

unlock ios screen

Step 2. Access the Recovery or DFU Mode

Before the Apple iPhone 14 Pro lock screen removal, we need to boot the phone in Recovery or DFU. If you have to do so, follow the steps given in the image below:

enter recovery mode

We suggest you open the recovery mode to remove the iOS screen lock. However, if you can’t figure out how to do so, go for the DFU mode.

Step 3. Affirm Device Model information

After going to the DFU mode, Dr.Fone will show the information about your Apple iPhone 14 Pro. From the following screen, confirm your phone model and iOS version. If it is isn’t correctly given, select the correct data pair from the drop-down menu. Then download the firmware package for your Apple iPhone 14 Pro.

select phone model

Step 4. Open the Lock

Click Unlock Now after downloading the firmware.

unlock now

After a short while, your Apple iPhone 14 Pro will be opened effectively. However, this process will erase every bit of data off your phone. Honestly speaking, there is no answer for this issue without data loss.

The Bottom Line

It is the end of a detailed guide with the top strategies on how to unlock disabled iPhones without computer. You should get the right approach per your circumstance and follow the steps.

If you don’t know which strategy will turn out best for you, we suggest utilizing Dr.Fone-Screen Unlock. It has a close to 100% success rate and is not difficult to use for individuals without a tech foundation. So, install it on your system for a quicker result.

4 Ways to Unlock Apple iPhone 14 Pro to Use USB Accessories Without Passcode

How do I unlock my Apple iPhone 14 Pro? I know you’re supposed to connect it to the computer and put it in recovery mode but when I do, it says “unlock Apple iPhone 14 Pro to use accessories.”

unlock-iPhone-to-use-accessories

You may have had the experience of connecting your Apple iPhone 14 Pro to a computer with USB accessories. Usually, “Unlock Apple iPhone 14 Pro to use accessories“ will appear on the screen. In most cases, enter the passcode to unlock the phone, and you can then proceed with data transfer and management. What to do if you forget your screen lock passcode? Here come the most effective methods for you!

Part 1: Why You Need to “Unlock Apple iPhone 14 Pro to Use Accessories”?

The command comes from Apple’s significant privacy safeguard “USB Restricted Mode”. It means after an hour of your iOS device is unlocked, the system cuts off the lightning port and limits it to charging only. Simply put, when your Apple iPhone 14 Pro is locked for more than an hour, it needs to be unlocked to allow the connection of USB accessories. Sometimes, when you unlock your Apple iPhone 14 Pro screen to use USB accessories, it can’t charge anymore.

In 2017, a password cracking tool called GrayKey was launched, which can bypass any iPhone screen lock passcode. The FBI, the police, and some government agencies have all become GrayKey customers. To combat hackers including GrayKey and protect iOS users’ data security, the USB Restricted Mode feature arrived with iOS 11.4.1 in July 2018 and be improved in iOS12.

Part 2: How to Disable USB Restricted Mode?

If you find this warning annoying or your Apple iPhone 14 Pro not charging when using USB accessories, disabling USB Restricted Mode is an optional solution. However, you have to remember the unlock passcode. All the steps will be presented to you next.

  • Step 1: Open Settings on your Apple iPhone 14 Pro.
  • Step 2: Click on Face ID & Passcode (or Touch ID & Passcode), and then input your screen passcode.
  • Step 3: Scroll to the bottom of the page and find “USB accessories“ in the “Allow access when locked“ column.
  • Step 4: Click the toggle button on the right to disable this feature.

After completing all the steps, your Apple iPhone 14 Pro can connect USB accessories anytime, anywhere. However, it is very common to forget to unlock the passcode. Next, we will recommend four solutions to help you use USB accessories without a passcode.

usb-restricted-mode

Part 3: How to Unlock Apple iPhone 14 Pro to Use USB Accessories without Passcode via Dr.Fone?

Now, here comes an amazing App with many benefits to solving the problem for you.  This is Dr.Fone-Screen Unlock, which is very convenient and fast to use. You must be curious about it. More of its advantages will be introduced to you.

  • The application is available on both Mac and Windows.
  • No technical skills are required.
  • It fully supports iPhone X, iPhone 11, and the latest iPhone models.
  • Dr.Fone - Screen Unlock can easily unlock 4-digit or even 6-digit screen passcode, Face ID, or Touch ID.
  • No Apple ID and password are needed.

Step 1: The first step, of course, is to download Dr.Fone to your computer and click on “Screen Unlock”.

run the program to bypass iphone lock screen

Safe downloadsafe & secure

Step 2: Connect your Apple iPhone 14 Pro to the computer with a lightning cable, and choose “Unlock iOS Screen”.

start to remove iphone lock screen

Step 3: Follow the guides to boot your device in Recovery or DFU mode. The Recovery mode is recommended for iOS lock screen removal by default. If you fail to turn on recovery mode, you can turn to activate DFU mode. DFU means Device Firmware Upgrade, and the operation is more mandatory.

boot device in dfu mode

Step 4: Click “Start” to download the firmware. After the download is successful, select “Unlock now” and wait a few minutes, the passcode will be removed from your device.

download iphone firmware

After that, you could set up your Apple iPhone 14 Pro as a new one and unlock your screen to use USB accessories without a passcode.

download iphone firmware

There is no doubt that you may worry about losing all your data while bypassing the Apple iPhone 14 Pro lock screen. But honestly, there is no tool on the market today that can preserve data to unlock an iPhone. Therefore, it is necessary to back up data in your daily life. Dr.Fone-Phone Backup provides you with a full range of data backup solutions, you can click the link below to learn more.

This guide will teach you about how to unlock iphone using 5 feasible ways.

Part 4: How to Unlock Apple iPhone 14 Pro to Use USB Accessories without Passcode via iCloud?

With iCloud, you can quickly clean up your Apple iPhone 14 Pro, remove screen locks, and help unlock your device. But, you have to know that all your data will be erased. Make sure your Apple iPhone 14 Pro has the “Find My iPhone” function enabled, otherwise your device will be offline.

Step 1: Open your computer or another iOS device, and sign in with your Apple account.

find-my-iphone

Step 2: Click on “All Devices”, choose your Apple iPhone 14 Pro, and then “Erase iPhone”.

icloud-erase-phone

Now, your Apple iPhone 14 Pro will reboot without a passcode. Then, you can unlock Apple iPhone 14 Pro to use accessories and bypass the passcode.

Part 5: How to Unlock Apple iPhone 14 Pro to Use USB Accessories without Passcode via iTunes?

There is currently no way to unlock an iPhone without erasing all data. Luckily, iTunes can help back up your data before removing it. Please note that this way is only possible if the Apple iPhone 14 Pro device has synced data in iTunes before.

  • Step 1: Connect Apple iPhone 14 Pro to a computer with a USB accessory and turn on iTunes. Then iTunes will make a backup for your phone.
  • Step 2: Choose “Restore iPhone”.

itunes-restore

Wait for a while and you could unlock the screen to use USB accessories. However, in step one, you may need to enter your passcode to get stuck during the process. Therefore, this method is not the most efficient.

Part 6: How to Unlock Apple iPhone 14 Pro to Use USB Accessories without Passcode via Recovery Mode?

If you have forgotten your Apple ID or password and have not synced iCloud and iTunes, you can choose recovery mode. It will remove all your passcode and data as well.

  • Step 1: You need to prepare a Mac or PC (Windows 8 or later).
  • Step 2: Turn off your Apple iPhone 14 Pro.
  • Step 3: Put your device in recovery mode. This step might be a little complicated, but don’t worry, we’ll walk you through it step by step.

1. Find the button on your device, it will be useful then.

  • iPhone SE (1st generation), iPhone 6s, and earlier: The Home button.
  • iPhone 7 and iPhone 7 Plus: The Volume down button.
  • iPhone SE (2nd and 3rd generation), iPhone 8, iPhone 8 Plus, iPhone X, and later devices: The side button.

2. Quickly press and hold the button while connecting your phone and computer until the recovery mode appears.

recovery-mode

Step 4: Find your tool in iTunes on the computer. Choose Restore and this process will take a few minutes.

Step 5: Unplug your tool and use your Apple iPhone 14 Pro without a passcode.

Now, you’ll get an iPhone which is like being factory reset. And you could unlock the screen to use USB accessories when you forget the passcode.

Part 7: Hot FAQ about USB Accessories on iPhone

Q1: What is the feature of USB Accessories on iPhone?

From USB-A to the latest, USB-C. Also, most iPhones use a proprietary Lightning port.

Q2: Why does My iPhone Think My Charger is a USB Accessory?

It is related to the capacity of the charger. If a low-capacity charger is used, your device must regard it as a USB port because the USB port charges at a lower rate than a good wall charger. Another possibility is that the cable being used is flaky.

Q3: What to Do If My iPhone Not Charging after Unlock to Use Accessories?

  • Step 1: Disconnect your tool from the accessory.
  • Step 2: Unlock your device.
  • Step 3: Connect the USB accessory again.

If it doesn’t work, please contact customer service of Apple.

Conclusion

It is very common to use USB accessories to connect iPhone and computer. Sometimes, we may forget the password, or cannot unlock the screen due to system failure. There are many ways to unlock Apple iPhone 14 Pro to use the accessories in the article. Finally, we recommend everyone to use Dr.Fone - Screen Unlock, a helpful and convenient tool.

Safe downloadsafe & secure

Did Your Apple iPhone 14 Pro Passcode Change Itself? Unlock It Now

The Apple iPhone 14 Pro changing passcodes itself is not a commonly reported issue, but it surely can happen to anyone. While the reasons are uncertain, the issue can be resolved without putting much strain on your device. If you face this iPhone passcode changed itself issue by any chance, it makes it hard for you to get into your Apple iPhone 14 Pro.

However, you don’t need to worry, as this well-organized guide provides authentic methods to solve this issue. You will also find a bonus tool to fix your iPhone/iPad passcode changed itself issue without any need of knowledge.

understanding unlock iphone passcode change itself

Part 1. What Are the Reasons for iPhone Passcode Changing by Itself

Before solving the Apple iPhone 14 Pro or iPad passcode changed itself issue, you should know the actual reason behind it. Here are some points that precisely explain why the Apple iPhone 14 Pro changed its passcode by itself:

  1. Frequent iOS Updates: One major issue that can cause the problem of iPhone passcodes changing by itself is the ongoing iOS updates. An update can sometimes cause major glitches in the Apple iPhone 14 Pro device, which might automatically change the credentials.
  2. iOS System Error: Many users are reportedly known for installing and using the Beta version of iOS on their iPhones/iPads. These versions are known to hold major glitches and bugs in the software. Usually, the Apple iPhone 14 Pro changing passcode issue is normally reported by users under such scenarios.
  3. Malware: Malicious apps can damage your system security and make your iOS device change the passcode automatically. This can either happen due to device hacking or system security breaches.

Part 2. [The Simplest Solution] Remove iPhone Passcodes With Wondershare Dr.Fone

There are multiple ways to resolve the “iPhone changed passcode itself” issue, but they can be consistently difficult. Here, Wondershare Dr.Fone provides the simplest solution to fix your Apple iPhone 14 Pro without putting any effort. When fixing your Apple iPhone 14 Pro’s screen locks, Wondershare Dr.Fone caters to different scenarios. From Touch ID to Face ID and other basic screen locks, this tool unlocks it within minutes.

It clearly shows that you can easily get yourselves out of the miserable iPhone changed passcode itself issue. This is not only what Wondershare Dr.Fone offers its users. You can also find a high success rate for unlocking carrier and MDM locks.

Key Features of Wondershare Dr.Fone

  1. Wondershare Dr.Fone is compatible with all iOS devices up to iOS 17, which allows everyone to get help using its advanced functionality.
  2. If you lose access to your Apple ID, it can bypass the iCloud Activation Lock and help you set up your iOS device like a new one.
  3. Without damaging the data, Wondershare Dr.Fone allows you to remove the iTunes backup encryption . This allows you to back up, restore, transfer, or easily wipe out your device’s data.

Comprehensive Guide To Unlock Screen Using Wondershare Dr.Fone

Wondershare Dr.Fone provides the simplest solution to unlock your Apple iPhone 14 Pro and remove the passcode change issue. Follow this step-by-step guide to complete the screen unlocking process without wasting any time:

  • Step 1. Start Tool and Choose Screen Unlock Function

Initially, launch Wondershare Dr.Fone on your computer and connect it to your concerned iPhone. Go into the “Toolbox” and choose the “Screen Unlock” function from the given options. Next, select “iOS” to run the process for the iOS device. Choose the “Unlock iOS Screen” option and hit the “Start” button to initiate the unlocking process.

start removing ios screen lock

  • Step 2. Put Your Apple iPhone 14 Pro in Recovery Mode and Confirm Status

After that, follow the on-screen instructions to put your Apple iPhone 14 Pro in the Recovery Mode. In the next window, you can see your device model recognized. Then, enter your “System Version” and hit the “Start” button again to continue.

set device model and version

  • Step 3. Download iOS Firmware and Confirm

Then, the system starts downloading the required iOS firmware according to your Apple iPhone 14 Pro model. Once the download is complete, click “Unlock Now” to implement the screen unlocking process. Enter the code in the confirmation box in the next window and choose the “Unlock” option.

use code to proceed with unlocking

  • Step 4. Install iOS Firmware To Unlock Completely

After that, you can see a progress bar of the unlocking screen process. Then, it takes you to the next window after completion, where you click the “Done” button to accomplish the process.

install ios firmware to unlock

Part 3. Set Up the Apple iPhone 14 Pro device Again Using the Security Lockout Procedure

Security Lockout or “iPhone Unavailable” happens when you attempt a wrong passcode 10 times. From there, you need to erase all your Apple iPhone 14 Pro data to regain access to the iOS device again.

While there is no direct way to regain access to your device when its passcode changes, you will have to perform a factory reset on your Apple iPhone 14 Pro to make it reusable. For that, look through the comprehensive guide on how to take your device out of this state:

  • Step 1. After getting your iOS 17 device into the “iPhone Unavailable” stage, tap the “Forgot Passcode?” option in the bottom right corner.
  • Step 2. To start the Apple iPhone 14 Pro reset, you need to tap on the “Start iPhone Reset.” Then, enter your Apple ID password in the given box and sign out your Apple ID. If you have an eSIM, you will be prompted with an option. Select the “Keep eSIM and Erase Data” or the “Delete eSIM and Erase Data” option according to your choice.

use security unlock option to unlock

In another case, Apple allows you to temporarily sign in to your Apple iPhone 14 Pro using a recently changed passcode within 72 hours. But once you get into your device, set a new passcode immediately to retain your full access.

Part 4. Using iTunes To Set Up iOS Device Again

iTunes service allows you to reset your Apple iPhone 14 Pro to factory settings and unlock the screen lock if the Apple iPhone 14 Pro passcode changes on its own. Using iTunes to set up your Apple iPhone 14 Pro again is a good and safe method, but it removes your device data. If you can compromise losing data, you can follow these instructions to remove the Apple iPhone 14 Pro Passcode Changed Itself issue using iTunes:

Instructions. Firstly, launch iTunes on your desktop and connect your Apple iPhone 14 Pro. Then, you need to progress into putting your Apple iPhone 14 Pro in the Recovery Mode . Continuing this, iTunes detects your device in Recovery Mode and shows two options: “Update” or “Restore.” Click on the “Restore” option and hit the “OK” button to restore your Apple iPhone 14 Pro and regain access.

restore ios device from itunes

Part 5. Using iCloud To Set Up iOS Device Again

Using iCloud to unlock iOS devices is a safe and recommended method, but it also leads to complete data loss. If you wish to consider using the iCloud method, it is important for the Find My service to be active on the Apple iPhone 14 Pro device. Also, you need to be aware of your Apple ID and password before proceeding. Follow this comprehensive guide step-by-step to set up your iOS device again using iCloud.

  • Step 1. First of all, open iCloud on your desktop web browser. Afterward, enter your “Apple ID” and “Password” to proceed. After trusting the Apple iPhone 14 Pro device, look for the “Grid” icon on the top right to find the “Find My” option in the list.

access find my service from icloud

  • Step 2. After that, choose the Apple iPhone 14 Pro device that you want to recover. Then, click the “Erase This Device” option to remove data and regain your device access.

erase ios device from icloud

Part 6. Using Find My App To Set Up iOS Device Again

This method needs you to have another iOS device signed into the same Apple ID with the Find My option enabled. After fulfilling these preconditions, you can follow these steps to set up your device whose iPhone passcode changed from 4 to 6 digits by itself:

  • Step 1. Launch the Find My App on any other device, select the “Devices” tab from the bottom menu, find your locked iPhone in the list, and tap on that.
  • Step 2. You must select the “Erase This Device” button to remove it from the iCloud account. This will instantly factory reset the Apple iPhone 14 Pro device as if it is a new iOS device.

select device and erase from app

Bonus Tip. How To Change Passcode on iPhone: A Simple Guide

We’ve discussed various reasons why the iPhone passcode changed itself above. However, there are several instances where you want to change the passcode yourself. What to do if you are looking for an effective way to change your Apple iPhone 14 Pro’s passcode? Follow the simple step-by-step guide to change the passcode from the iDevice’s “Settings:”

  • Step 1. First, open iPhone “Settings” and go to the “Face ID & Passcode” option to access the Apple iPhone 14 Pro device’s security settings.

open passcode security settings

  • Step 2. After that, tap “Change Passcode” and enter your six-digit passcode to see passcode options. Open “Passcode Options” and set a four-digit passcode easily or vice versa.

change passcode according to requirements

Conclusion

In this article, we’ve gone through the scenario of iPhone/iPad passcode changing itself due to system glitches. To fix this problem, we have introduced some effective and reliable methods with simple steps. However, Wondershare Dr.Fone is the recommended tool to bypass this issue because it provides a high success rate with an easy-to-follow system.

Tips: Are you searching for a powerful Screen Unlock tool? No worries as Dr.Fone is here to help you. Download it and start a seamless unlock experience!


  • Title: In 2024, Unlocking Apple iPhone 14 Pro Passcode without a Computer
  • Author: Sophia
  • Created at : 2024-03-30 10:19:22
  • Updated at : 2024-04-01 11:27:23
  • Link: https://ios-unlock.techidaily.com/in-2024-unlocking-apple-iphone-14-pro-passcode-without-a-computer-by-drfone-ios/
  • License: This work is licensed under CC BY-NC-SA 4.0.
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In 2024, Unlocking Apple iPhone 14 Pro Passcode without a Computer