The blue screen with APC_INDEX_MISMATCH in Windows 10 is mainly due to an inconsistent call sequence for enabling and disabling APC (Asynchronous Procedure Call). In most cases, faulty system files and drivers are responsible for this error. However, it may still vary from system to system.
Sometimes Windows fixes blue screens by itself, sometimes they need to be fixed with workarounds. You can easily get rid of this blue screen of death with APC INDEX MISMATCH in Windows 10 by adjusting device drivers and getting rid of problematic programs.
Solutions for APC INDEX MISMATCH on Windows 10
Windows prevents you from connecting normally with a BSOD. To resolve this and get rid of the error, you must connect in secure mode. If you do manage to connect and APC_INDEX_MISMATCH appears randomly, you can still resolve the problem in normal mode.
Enable safe mode in Windows 10
In such situations, you can start Windows 10 in secure mode using the Windows recovery environment.
To do this, turn the system off by pressing the power switch. Press and hold the power switch again until you see the start logo on the display. Repeat this procedure until the message “Preparing for automatic recovery” appears on the display.
Then click on the “Advanced Options” button and go to “Troubleshooting”. ➜ “Advanced Options” ➜ “Startup Settings”.
Press the Reboot key and then the F4 key on the keyboard to enter Safe Mode. Once you are in safe mode, try to correct the errors described below one by one until you find a solution that helps you get rid of the APC error “INDEX MISMATCH”.
1. update the Windows 10 operating system.
Windows releases regular updates to fix bugs and problems from the previous version. The cause of your blue screen error may be an error in Windows Update. Windows Update can help you resolve the APC INDEX MISMATCH error.
Press the Windows + I key to open the Settings application and access the update and security settings.
Now click Check for Updates to see if there are any new updates for your system.
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Click the “Download and install” link if there are new updates. Restart the computer to install the latest updates. After the restart, check if the blue screen error is fixed.
2. Disable the Realtek HD Audio Manager through Task Manager.
You can disable the Realtek HD Audio Manager service from the Start tab of Task Manager. This solution has enabled many users to get rid of APC_INDEX_MISMATCH in Windows 10.
Press Ctrl + Shift + Esc to open Task Manager and click Details if the tabs and applications are not visible.
Now click on the Run tab and look for the Realtek HD Audio Manager. If it is found, right click on it and select Disable.
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Note: If you are not in safe mode, you may need to log in as an administrator to disable Realtek HD Audio Manager. A normal account does not have the ability to disable this service.
Then restart the computer and check that it turns on normally.
Remove the DisplayLink driver from the PC.
The DisplayLink driver is used when you have two or more monitors installed on your PC. It improves performance, but seems to have caused a MISMATCH INDEX APC in Windows 10 for many users.
Users who have removed the DisplayLink driver from their system have been able to resolve blue screen issues on their system.
Search for “Control Panel” in the Start menu and open it from the search result. Now click on the “Uninstall a program” box in the Programs section. Make sure that the Category View option is enabled.
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Look for DisplayLink Core in the list of applications. If it is found, right-click on it and click Uninstall to remove it from your system. You may need to follow the on-screen instructions to completely remove the application from your PC.
Restart the computer after the uninstallation is complete and check whether the BSOD is locked or not.
4. removal of third-party software and antivirus software
If you experience problems after installing a new third-party application or antivirus program, temporarily uninstall it to remove the interference. Application files can conflict with system files and cause unwanted problems.
There may also be compatibility issues with installed software. You can remove the application by going to Settings ➜ Apps. Search for the application or antivirus software here and press it when the search result appears.
Finally, click the “Delete” button to remove it from the system.
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Note: You can also temporarily uninstall a recently updated application. Because sometimes updates contain bugs or are not compatible, resulting in a blue screen on your computer.
Then restart the PC and check if APC_INDEX_MISMATCH is fixed in Windows 10 or not. If not, reinstall the application/antivirus as they are not the culprits.
Replace the RAM frequency with the default value.
Windows users change the frequency of RAM to improve system performance. Usually, overclocking is done by changing the clock speed to increase the speed of the processor. Gamers and power users who need to speed up their CPU often make these changes.
If you have recently done something similar, you need to undo these settings to fix APC INDEX MISMATCH in Windows 10. It is recommended that you uninstall the software used for overclocking or downclocking.
The problem may also occur if you have a downlink on your system. Such changes in RAM frequency can cause unwanted blue screen crashes on your system, so it is recommended that you change the RAM frequency to the default value to eliminate unwanted errors.
6. clean sailing
You can find the software and services that cause the blue screen error on restart. And if you find the program annoying, remove it from your PC.
Step 1: Open Run by pressing Windows + R and type msconfig here. Press Enter to open the system configuration screen.
Step 2: In the System Configuration window, click the Services tab and select the Hide All Microsoft Services check box.
Step 3: Click on the “Unmount All” button.
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Step 4: Now go to the “Run” tab and click on “Open Task Manager”.
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Step 5: Make sure you are in Task Manager on the Start tab. Then select unnecessary startup applications and services in order and click Disable.
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Close the Task Manager window and click OK on the System Configuration page. Then restart the PC and check whether the APC INDEX MISMATCH BSOD problem is solved or not.
You can then activate the services and software one by one using the method described above to find the intruder.
7. Perform an SFC scan.
System files play a crucial role in the performance of your Windows computer. If just one of the system files is corrupt or damaged, you can test APC_INDEX_MISMATCH on Windows 10. You can use the Windows SFC (System File Checker) utility to repair the system files.
Open a command prompt with administrator privileges and run the following command in the terminal.
Windows will scan and repair all damaged system files after running the command. You can refer to the manual of the sfc /scannow command for more information.
8. update the driver
Faulty or outdated drivers are one of the most common reasons for the APC INDEX MISMATCH error in Windows 10. You can update the drivers yourself or use third-party software like Driver Booster to do it for you.
To check which drivers need updating, press the Windows + X key and click on Device Manager to open it.
Now unfold all the sections and see which driver has an exclamation mark (!), question mark (?) or yellow dot next to it. The driver that has such a mark, update it. Make sure you have updated the drivers by downloading the drivers from an authorized source.
9. check the display of events
You can consult the Event Log to find out what error on your system caused APC_INDEX_MISMATCH to appear in Windows 10. This may require some technical knowledge, but you can check the Event Log and view the web error.
Search for Event Viewer in the Start menu search box and open it from the search result. In the Event Viewer window, navigate through the different sections in the left pane. You can click Open Saved Log if you want to view the log for a specific section.
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You can find the exact cause of the blue screen failure on your system using the Event Viewer. And if you know the cause, it’s easy to find a solution.
10. Disable BIOS display
You can disable the display in the BIOS to fix the blue screen of death you are currently experiencing. Sometimes the display can interfere with some antivirus programs and cause an APC INDEX MISMATCH error. To disable the display, go to the BIOS and follow these steps.
Step 1: Launch the “Settings” application and go to “Updates and Security”.
Step 2: In the left panel, go to Restore and click Restart Now under Advanced Startup.
Step 3: After rebooting, go to the Troubleshooting ➜ Advanced Settings ➜ UEFI Firmware Settings page to go to the BIOS.
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You can also choose the Windows 10 BIOS connection method indicated on the manufacturer’s website.
Once in the BIOS, locate the display settings and disable them using the keyboard. After you have disabled the display, save your changes to the BIOS and carefully exit the BIOS. Be careful not to make any unwanted changes, as this can permanently damage your system.
Restart the computer normally and check if the BSOD error disappears after restarting.
Install the latest version of the Realtek driver for high-resolution audio.
You can download and install the latest version of Realtek High Definition Audio Driver to fix APC INDEX MISMATCH on Windows 10. Many users have experienced blue screen failures due to outdated Realtek HD Audio drivers.
You can visit Realtek’s official website and download the latest version for your system. After downloading the driver software, click on it and follow the on-screen instructions to install it.
Restart the computer, start the installation, and verify that the APC INDEX MISMATCH BSOD error is resolved.
12. Use the usual Windows sound driver.
If installing the latest Realtek audio driver did not work, you can try using the generic Windows audio driver to fix the blue screen error on your computer.
Step 1: Open Device Manager and expand the Sound, Video and Game Controllers section.
Step 2: Right-click on Realtek High Definition Audio and select Uninstall Device.
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Step 3: Follow the on-screen instructions to complete the removal. Next, open the Control Panel and click on the “Uninstall a program” link under “Programs”.
Step 4: In the program list, search for the Realtek High Definition Audio Driver. If it is found, right-click on it and select Uninstall/Modify to remove it from the device.
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Complete the uninstallation process and reboot the PC. After rebooting, Windows will automatically install the generic audio drivers. You can now check whether this fixes the BSOD APC_INDEX_MISMATCH on Windows 10 or not.
13. restart the PC
You can reset your computer to get rid of unwanted blue screen problems for good. The reset will not delete your files and folders. This process only removes third-party applications that you have installed.
There is also an option to delete and save all files, which you can choose according to your preference. The reset process is simple, just follow the on-screen instructions.
To reset your PC, go to Settings ➜ Update and Security ➜ Restore and then click Start under Reset this PC. Your PC will reboot. Therefore, back up all unsaved files and close all open applications.
You can also read our Windows 10 Reset Guide for details on the full reset process.
14. check the device
If none of the above fixed the APC INDEX MISMATCH BSOD error, you should check the hardware malfunction. Sometimes a touchpad or motherboard hardware failure can cause the APC INDEX MISMATCH BSOD error in Windows 10.
You can go to the manufacturer’s store and get your equipment problems fixed. If your computer is still under warranty, you can do this for free. Make sure you go to an authorized and trusted dealer to get your computer’s hardware problems fixed.
The blue screen of death can be scary for Windows users. And most users have experienced this problem at least once in their lives while working on a Windows computer. Most blue screen errors are related to a glitch in your device’s software and can be easily corrected by adjusting the system settings.
APC_INDEX_MISMATCH on Windows 10 is caused by faulty drivers, hardware problems and corrupted system files. You can fix all of the above, except for hardware errors, by yourself. The above article lists all the solutions that can help you fix APC INDEX MISMATCH blue screen on Windows 10.
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