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If your computer doesn't recognize your connected device, you might see an unknown error or a '0xE' error. If you do, follow these steps and try to connect your device again after each step:

1. Make sure that your iOS or iPadOS device is unlocked and on the Home screen.
2. Check that you have the latest software on your Mac or Windows PC. If you're using iTunes, make sure you have the latest version.
3. Make sure that your device is turned on.
4. If you see a Trust this Computer alert, unlock your device and tap Trust.
5. Unplug all USB accessories from your computer except for your device. Try each USB port to see if one works. Then try a different Apple USB cable.*
6. Restart your computer.
7. Restart your device:
8. Try connecting your device to another computer. If you have the same issue on another computer, contact Apple Support.
   

For more help, follow the steps below for your Mac or Windows PC. Download silicon laboratories driver.

Sigma micro usb devices driver.
* Learn how to connect iPad Pro (11-inch) or iPad Pro 12.9-inch (3rd generation) to your computer.

If you use a Mac

1. Connect your iOS or iPadOS device and make sure that it's unlocked and on the Home screen.
2. On your Mac, hold down the Option key, click the Apple menu, and choose System Information or System Report.
3. From the list on the left, select USB.
4. If you see your iPhone, iPad, or iPod under USB Device Tree, get the latest macOS or install the latest updates. If you don't see your device or still need help, contact Apple Support.
   

If you use a Windows PC

The steps differ depending on if you downloaded iTunes from the Microsoft Store or from Apple.

If you downloaded iTunes from the Microsoft Store

Follow these steps to reinstall the Apple Mobile Device USB driver:

1. Disconnect your device from your computer.
2. Unlock your iOS or iPadOS device and go to the Home screen. Then reconnect your device. If iTunes opens, close it.
3. Click and hold (or right-click) the Start button, then choose Device Manager.
4. Locate and expand the Portable Devices section.
   
5. Look for your connected device (such as Apple iPhone), then right-click on the device name and choose Update driver.
   
6. Select 'Search automatically for updated driver software.'
7. After the software installs, go to Settings > Update & Security > Windows Update and verify that no other updates are available.
8. Open iTunes.

If you downloaded iTunes from Apple

Follow these steps to reinstall the Apple Mobile Device USB driver:

1. Disconnect your device from your computer.
2. Unlock your iOS or iPadOS device and go to the Home screen. Then reconnect your device. If iTunes opens, close it.
3. Press the Windows and R key on your keyboard to open the Run command.
4. In the Run window, enter:
   %ProgramFiles%Common FilesAppleMobile Device SupportDrivers
5. Click OK.
6. Right-click on the usbaapl64.inf or usbaapl.inf file and choose Install.
   You might see other files that start with usbaapl64 or usbaapl. Make sure to install the file that ends in .inf. If you’re not sure which file to install, right-click a blank area in the File Explorer Window, click View, then click Details to find the correct file type. You want to install the Setup Information file.
7. Disconnect your device from your computer, then restart your computer.
8. Reconnect your device and open iTunes.

If your device still isn't recognized

Check Device Manager to see if the Apple Mobile Device USB driver is installed. Follow these steps to open Device Manager:

1. Press the Windows and R key on your keyboard to open the Run command.
2. In the Run window, enter devmgmt.msc, then click OK. Device Manager should open.
3. Locate and expand the Universal Serial Bus controllers section.
4. Look for the Apple Mobile Device USB driver.
   

If you don't see the Apple Mobile Device USB Driver or you see Unknown Device:

• Connect your device to your computer with a different USB cable.
• Connect your device to a different computer. If you have the same issue on another computer, contact Apple Support.

If you see the Apple Mobile Device USB driver with an error symbol:

If you see , , or next to the Apple Mobile Device USB driver, follow these steps:

1. Restart the Apple Mobile Device Service.
2. Check for and resolve issues with third-party security software, then restart your computer.
3. Try to install the usbaapl64.inf or usbaapl.inf file again.

Below are steps users can follow to help speed up a computer or determine why a computer is running slow. It should be noted that this page only covers an overall slow computer and not a computer that starts slow or has a slow Internet connection. To diagnose those issues, visit the following pages:

Reboot

If your computer has not been rebooted recently, make sure to reboot it before following any of the steps below. Rebooting the computer can fix many problems and is an easy first step.

Background programs

One of the most common reasons for a slow computer is programs running in the background. Remove or disable any TSRs and startup programs that automatically start each time the computer boots.

To see what programs are running in the background and how much memory and CPU they are using, open Task Manager. If you are running Windows 7 or higher, run Resmon to get a better understanding of how your computer resources are used.

If you have an antivirus scanner on the computer, spyware protection program, or another security utility, make sure it's not scanning your computer in the background. If a scan is in progress, it decreases the overall performance of your computer. If this is the case, allow the scan to complete, and the computer's performance should improve.

Delete temp files

As a computer runs programs, temporary files are stored on the hard drive. Deleting these temp files help improve computer performance.

Windows computers

First, we suggest using the Windows Disk Cleanup utility to delete temporary files and other files no longer needed on the computer.

Unfortunately, the Disk Cleanup may not delete every file in the temp directory. Therefore, we also suggest deleting temporary files manually.

1. Open the Start menu or and press the Windows key, then type %temp% in the Search field.

In Windows XP and prior, click the Run option in the Start menu and enter %temp% in the Run field.

2. Press Enter and a Temp folder should open.
3. You can delete all files found in this folder and, if any files are in use and cannot be deleted, they can be skipped.

Free hard drive space

Verify that there is at least 200-500MB of free hard drive space. This available space allows the computer to have room for the swap file to increase in size and give room for temporary files.

Bad, corrupted or fragmented hard drive

Check the hard drive for errors

On a Windows computer, run ScanDisk, chkdsk, or something equivalent to verify there is nothing physically wrong with the computer's hard drive.

On a macOS computer, access the Disk Utility program, and use the First Aid option to check the hard drive for errors. To open Disk Utility:

1. Click the Launchpad icon on the dock.
2. Open the Other folder.
3. Click Disk Utility to open the program.

Make sure hard drive is not fragmented

Run Defrag to help ensure that data is arranged in the best possible order.

Test hard drive

Use other software tools to test the hard drive for any errors by looking at the SMART of the drive.

Scan for viruses

If your computer is infected with one or more viruses, it may run more slowly. If your computer doesn't have an antivirus program installed, run Trend Micro's free Housecall online utility to scan and remove viruses on your computer. We also recommend you install an antivirus program for active protection against viruses.

Scan for malware

Today, spyware and other malware is a big cause of many computer problems, including slower performance. Even if an antivirus scanner is installed on the computer, we recommend running a malware scan as well. Use the free version of Malwarebytes to scan your computer for malware.

Hardware conflicts

Verify that the Device Manager has no conflicts. If any exist, resolve these issues as they could be causing your problem.

Update the operating system

To update a computer running Microsoft Windows, run Windows Update.

To update a macOS computer, run Software Update. To upgrade the operating system, use the App Store.

Disable browser plug-ins

If your computer runs especially slow when you're using your web browser, considering disabling any browser plug-ins, add-ons, or extensions.

Update your drivers

Make sure you have the latest drivers for your computer hardware, especially the latest video drivers. Having out-of-date drivers can cause an assortment of issues, including slow performance.

Reboot the computer again

After making any of the changes above, reboot your machine.

Run a registry cleaner

If you have a Mac computer, skip this section, as there is no registry in macOS.

We usually do not recommend registry cleaners. However, if you followed all the steps above and your computer is still slow, try running a registry cleaner on the computer.

Memory upgrade

If you have had your computer for more than two years, you may need more memory. Today, we suggest computers have a minimum of 2 GB of memory (RAM) for a 32-bit system and 4 GB for a 64-bit system. By having enough memory for programs to run within memory, your computer doesn't need to swap information stored in memory to the swap file. If the hard drive light is continuously active, it's an indication the computer is frequently swapping information between your memory and hard drive.

Hard drive upgrade

One of the biggest bottlenecks of a computer is the hard disk drive. Upgrading from a standard hard drive to a Solid State Drive (SSD) drastically improves the computer's performance.

Computer or processor is overheating

Make sure your computer and processor is not overheating. Excessive heat can cause a decrease in the computer's performance because most operating systems automatically reduce the speed of the processor to help compensate for heat-related issues.

Dust, dirt, and hair can also constrict proper airflow inside your computer, which causes a computer to overheat. Make sure your computer case is clean, and that the fans are not obstructed.

Increase or upgrade the processor speed

Increasing the speed of the processor (CPU) can improve your computer's performance. There are two options for increasing processor speed: overclocking or upgrading.

Overclocking a processor means increasing its speed beyond what it's designed to run stably. While overclocking can increase the processor speed, the increase is often not very significant, resulting in maybe a 10% or 20% speed increase at most. Furthermore, the processor itself must be capable of being overclocked. You would need to find the specifications for the processor in your computer to determine if it can be overclocked. An overclocked processor generates more heat, thus requiring a more powerful heat sink and fan to pull the excess heat away from the processor.

A safer alternative to overclocking is upgrading the processor in your computer. You would need to get the specifications for your motherboard to determine what type of newer processor may be used in it. You can then install the new processor in place of the existing processor.

Erase computer and start over

If none of the solutions above resolve your issues, another option is to reinstall the operating system, or you can erase everything and start over.

Erasing everything on your computer and reinstalling the operating system can increase performance by getting rid of old software or drivers. Installing a fresh copy of macOS or Windows, software programs, and the latest drivers help verify there are no software related issues causing your computer to be slow.

Hardware issues

Finally, if your computer is still slow after trying the above recommendations, there's likely a more serious hardware related issue (e.g., failing component). Examples of failing hardware could include the hard drive, CPU, RAM, motherboard, or other components.

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You can run hardware diagnostic tests using the Ultimate Boot CD (UBCD) utility. This utility provides information on whether or not your computer has a bad piece of hardware.

Old computer

If your computer is more than five years old, it performs slower than a new one. As more advanced software programs are released, they are optimized to run more efficiently on newer computers. Older computers are not able to run these new programs as well, which causes them to perform more slowly. Furthermore, new software tends to be more demanding in general, which is another problem for old hardware. We recommend you consider purchasing a new computer or upgrading your current one.

Additional information

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• See our slow definition for all links relating to slow computers.