How to Fix SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (atikmdag.sys) BSOD on Windows?

by Olivia Morelli - -


Issue: How to Fix SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (atikmdag.sys) BSOD on Windows?

Hello all. I would highly appreciate someone’s help. It’s a second day counting when I cannot boot my PC up. When I try to do so, I get a BSOD with SYSTEM_THREAD_EXCEPTION_NOT_HANDLED related to the atikmpag.sys file. Thanks in advance!

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Solved Answer

Blue Screen of Death (abbreviated as BSOD) is a fatal Windows error, which is generated as a full screen window and, typically, prevents the system from booting. It is also known as STOP error, Blue Screen of Doom, bug check, and similar names. BSOD errors may be fake — triggered by malware, but, in most of the cases, the culprit is related to serious system crashes like driver software, hardware failure, and failure of the software running in the Windows kernel. Typically, regular apps do not trigger BSOD errors. Not only these errors prevent the system from booting, but may also cause data loss.

showing atikmdag.sys BSOD error

Recently, few people reported SYSTEM_THREAD_EXCEPTION_NOT_HANDLED, which, although has already been described in our blog, appears to be having a new form and trigger. This time, the error shows up with a file name next to it – SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (atikmdag.sys). The Atikmdag.sys file is a software component of ATI Radeon Family developed by Advanced Mirco Devices, Inc. It functions as a system driver, which enables hardware components to communicate with software without additional programming from the software developer. Therefore, the atikmdag.sys BSOD cannot be fixed by deleting or otherwise modifying the file itself.

The atikmdag.sys BSOD usually shows up when Windows users try to upgrade or soon after upgrading Windows 7, 8 or 8.1 to the Windows 10 build 1703. Most of the people who reported the bug use PCs that have AMD graphic cards. In this case, the culprit of the SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (atikmdag.sys) BSOD is related to the external graphic card drivers, which runs into conflict with the hardware.

A Guide on How to Fix SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (atikmdag.sys) BSOD on Windows

If you have managed to boot into your PC eventually (normally or in Safe Mode), please try the first method. If you cannot boot your system anyway, try the second atikmdag.sys error fix. To perform the last method, prepare a bootable Windows USB drive.

Method 1. Reinstall conflicting driver

  • Start your PC up and press F8 before Windows logo screen opens.
  • Now select Troubleshoot and select Advanced Options.
  • Select Startup Settings and press F4 or F5 on the following screen.
  • Once the PC boots up into Safe Mode, right-click Windows key and open Device Manager. Alternatively, you can press Windows key + R, type devmgmt.msc, and press Enter.
  • Expand Display Driver section, select the conflicting driver, and click Uninstall from the context menu.
  • Close Device Manager and open Control Panel.
  • Go to Programs and Features and locate the AMD Catalyst Install Manager. The latter name may differ, so if you cannot find AMD Catalyst Install Manager, look for another software related to the graphics card.
  • Click it and select Uninstall.
  • Once the removal is finished, reboot the system.
  • Finally, navigate to the manufacturer’s website of the driver that you have removed before and install it.

Method 2. Repair your PC using Windows Installation Media

If, unfortunately, you cannot boot Windows due to the atikmdag.sys STOP error, instet a drive with the Windows 10 Installation Media. If you don't have the disc yet, you can create it by following the steps given on this page.

  • Reboot the PC and press any key to boot the system from the installation media.
  • Select language, time, currency, and keyboard/input method and press Next.
  • Click Repair your computer (NOT Install Windows) and select the type of OS you want to repair.
  • Click Troubleshoot.
  • Select Advanced and click Automatic Repair or Startup Repair.
  • When the system detects the OS, select the one that is running on your PC.
  • Finally, unplug the USB or remove DVD bootable media and try to boot your device.

If the bug has reoccured and you cannnot boot Windows anyway, try these steps:

  • Click Power button and try to boot your PC.
  • Press F8 key repeatedly at boot and select Repair your computer.
  • Select Command Prompt and type the following commands.
  • Press Enter after each one and DO NOT remove the space before / symbol.

bootrec /fixMBR
bootrec /fixBoot
bootrec /rebuildBCD

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