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

Issue: Hello all. I would highly appreciate someone’s help. It’s the 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!

Solved Answer

Blue Screen of Death (abbreviated as BSOD)[1] 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.

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.[2] This time, the error shows up with a file name next to it – SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (atikmdag.sys). A particular user has claimed that this type of BSOD error appeared when he was trying to use X-Plane simulator on his PC.[3]

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.

showing atikmdag.sys BSOD errorAtikmdag.sys BSOD is an error that prevents the computer system from booting properly

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.

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.

However, if none of these methods have appeared successful to you (which is occasionally rare), there might be a malicious problem that has been triggering the appearance of this error. To find out if this speculation is true or false, you should scan your machine with software such as FortectMac Washing Machine X9

Method 1. Reinstall conflicting driver

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To repair damaged system, you have to purchase the licensed version of Fortect.
  • 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. Fix of atikmdag.sys BSOD error on WindowsUpdate drivers to get rid of atikmdag.sys BSOD error code on Windows
  • Expand Display Adapters 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. Fixing atikmdag.sys BSOD problemEliminate programs to remove atikmdag.sys BSOD error from your Windows machine
  • 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. Undo recent changes by opting for System Restore

There might have been some unknown changes performed on your machine lately that can be the cause of SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (atikmdag.sys) BSOD error. In order to find out if the problem is hiding here, try reversing modifications with the help of these steps:

  • Locate Windows Search.
  • Type in “system restore”.
  • Click the Enter key.
  • Select System Restore and follow the given instructions to create a restore point. Taking care of atikmdag.sys BSOD error on Windows 10Create a restore point to fix atikmdag.sys BSOD error code
  • Reboot the machine when you are finished.

Method 3. Opt for the “sfc /scannow” command

Fix it now!
To repair damaged system, you have to purchase the licensed version of Fortect.
  • Launch Command Prompt (Administrator) via Windows Search.
  • You also can press the Win key and R button at the same time. When a run box shows up, type “cmd”.
  • Once the black window appears, type “sfc /scannow” and hit Enter. Removing atikmdag.sys BSOD error codeRun a scan with cmd to get rid of atikmdag.sys BSOD problem
  • Complete all the commands that you are given.

Method 4. Install missing updates

  • Go to Windows Search and type “windows update”.
  • After hitting Enter, the Windows Update window should appear.
  • Check if there are any available updates. Elimination of atikmdag.sys BSODCheck for available Windows Updates to see if this is what has been causing the appearance of atikmdag.sys BSOD error
  • If there are some, opt for Install Updates.

This method might be helpful for those who have some updates that have not been installed properly and might be forcing the BSOD error to show up. However, if this appears not to be the problem, continue with other techniques.

Method 5. Check your disk for possible damage

Fix it now!
To repair damaged system, you have to purchase the licensed version of Fortect.
  • Type “cmd” in the Windows Search zone.
  • Open Command Prompt with Administrative powers.
  • Once the black dialogue box appears, type in the “chkdsk /f” command and press Enter.
  • After that, follow any commands that you are provided with and hope for the best.

Method 6. 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 reoccurred and you cannot 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. Atikmdag.sys BSOD fixRun commands in Command Prompt to fix atikmdag.sys BSOD
  • Press Enter after each one and DO NOT remove the space before / symbol.

bootrec /fixMBR
bootrec /fixBoot
bootrec /rebuildBCD

Repair your Errors automatically team is trying to do its best to help users find the best solutions for eliminating their errors. If you don't want to struggle with manual repair techniques, please use the automatic software. All recommended products have been tested and approved by our professionals. Tools that you can use to fix your error are listed bellow:

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Still having problems?
If you failed to fix your error using Fortect, reach our support team for help. Please, let us know all details that you think we should know about your problem.
Fortect - a patented specialized Windows repair program. It will diagnose your damaged PC. It will scan all System Files, DLLs and Registry Keys that have been damaged by security threats.
This patented repair process uses a database of 25 million components that can replace any damaged or missing file on user's computer.
To repair damaged system, you have to purchase the licensed version of Fortect malware removal tool.

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Recover your lost files quickly

Unforeseen circumstances can happen at any time while using the computer: it can turn off due to a power cut, a Blue Screen of Death (BSoD) can occur, or random Windows updates can the machine when you went away for a few minutes. As a result, your schoolwork, important documents, and other data might be lost. To recover lost files, you can use Data Recovery Pro – it searches through copies of files that are still available on your hard drive and retrieves them quickly.


About the author
Olivia Morelli
Olivia Morelli - PC & Mac repair expert

Olivia Morelli is a young, but a perspicacious IT expert who is currently just a year away from a Bachelor’s Degree in Software Systems. Her primary passion is cyber security, however, thanks to her detailed understanding of computer networks, operating systems and hardware, she can find a fix for any PC or Mac issue...

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