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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?

Community
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yellow-saint
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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 '14 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 '14 at 23:09
  • @Jason I'll have to retry Safe Mode tomorrow then... can't imagine why it didn't work before. – yellow-saint Jul 25 '14 at 01:17

2 Answers2

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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.

Jason
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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 '14 at 08:40
  • @and31415 Yes, of course, my bad. I've corrected my answer and elaborated even further. – Jason Jul 25 '14 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.

magicandre1981
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