Do I need a new GPU?
I was playing BF3 on Windows and my Imac froze. It won't reboot on Windows (black screen and then it reboots on its own). It does on Mac OS but here's what happens
Then it shuts down like that
Apple extensive hardware test doesn't find anything and the display is fine while running test or booting, but it goes crazy as soon after the apple disappears. I zapped the PRAM and the SM but nothing changed.
My theory is that the GPU (ATI 4850) is involved. It would cost me more than 600$ to have it replaced (520 euros at my local Apple premium reseller). Is my theory right? Do I need to replace the GPU? I'm not scared of trying things on my own, au contraire :) what could I try to do?
Thanks for your help
Alex from France
This is what happens everytime I reboot and I repair permissions
I reboot on safe mode, some display problems remain but at least the computer is usable, even though pretty slow. When I reboot on recovery, it is extremely slow.
I cleaned all the cache with Onyx and did all the tests Onyx has to offer, but nothing was found.
I have access to a 27 Imac for the day. I booted Imac 27 with Imac 24 on target mode, everything was fine. Tried to boot Imac 24 with the 27 on target mode, all I had after the apple was a psychedelic grey screen.
Does anything make sense to you? I check the temperatures with Istat Pro and the GPU was at around 60°C (the rest around 50°).
What I don't get is how a Windows crash can affect my Mac OS X partition? Unless there's a problem with firmware and EFI but utility disk says everything's fine. Also, I cannot boot on Windows safe mode, the computer does not respond to F8 or Fn + F8.
So Machead, could you be more specific please? How would you clean cache files and preferences? Put them in the trash? And what is WinDUhoze files? Couldn't find anything about it.