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Situation:

  • (See also for context: a previous question)
  • Cannot access Win7 (bootcamp) system via screen, as AMD GPU is bust
  • Win7 Safe Mode does not help
  • Can run OSX partition as managed to manually disable AMD drivers via single-user boot

So...

What I want to do:

What I want to try to do is disable the Win7 AMD (Radeon HD 6490M) driver via Mac's Finder.app (have NTFS rw capability).

How would I go about that? Is it possible?


Follow-up question

Can I then manually install a Intel HD Graphics 3000 driver purely via Finder?

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  • If you attempt this its very likely you will cause Windows to become unbootable. What was wrong with your previous question?
    – Ramhound
    Jul 24, 2014 at 23:06
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    FYI, safe mode does start Windows using a basic VGA driver and not the AMD driver.
    – Jason
    Jul 24, 2014 at 23:09
  • @Jason I'll have to retry Safe Mode tomorrow then... can't imagine why it didn't work before. Jul 25, 2014 at 1:17

2 Answers 2

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Device configuration is stored in the registry file C:\Windows\System32\config\SYSTEM. However, I'm not aware of OS X having any way of editing a Windows registry file.

If you want to edit the registry without using Windows, you could use something like Offline NT. You will find keys related to display driver configuration under HKLM\SYSTEM\CurrentControlSet\Control\Video.

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  • Not really. The NTUSER.DAT file is mapped to the HKEY_CURRENT_USER registry hive. Device configuration is stored in the HKEY_LOCAL_MACHINE branch under the SYSTEM subkey. The actual data is stored in an identically named file which is located in the Windows\System32\config folder.
    – and31415
    Jul 25, 2014 at 8:40
  • @and31415 Yes, of course, my bad. I've corrected my answer and elaborated even further.
    – Jason
    Jul 25, 2014 at 15:07
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Rename the AMD drivers (atikmdag.sys and atikmpag.sys) in Windows\System32\Drivers. Now Windows should not start the AMD GPU.

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