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Here are the specs:

  • Windows 7 64-bit
  • ATI Radeon HD 4850

Here's the antefact:

I was messing around with drivers trying to enable OpenCL. I might have involuntarily installed Catalyst 11.1 before sweeping the old drivers first. The thing quickly got out of hand resulting in me going on a driver sweeping rampage, uninstalling then wiping the ATI drivers from my machine.


The machine went into VGA adapter mode (it doesn't even see that it's a ATI card any more because there's no drivers), and if I try to reinstall Catalyst the 'display driver' component no longer shows up any more during the install process as it used to. I'm able to choose to install all sorts of other things but not the display drivers.

Any ideas how I can resolve this?

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In Device Manager, did you find the errant video adapter? You may be able to coerce Windows Updates to help you out with it there. – user3463 Feb 13 '11 at 5:57
man, thanks! I was able to detach the device then do a scan for hardware changes and it went back to the way it was. I am back to square one (no OpenCL), but at least not in VGA mode. If you post your suggestion below I'll mark as answer. – JohnIdol Feb 13 '11 at 13:11
up vote 0 down vote accepted

Solved this - turns out my iMac mounts a MOBILITY card but Apple sells it as the standard HD 4850. I was trying to install drivers for the non-mobility version of the card.

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