I have a iMac 2011 and my Radeon 6970 card give up on me. I could not boot the iMac. One way to recover files is to use Target disk mode: Just hold down T on the keyboard and then use a Firewire cable to connect to another mac. Once in target disk mode you can get the iMac to to boot by disabling the GPU kernel extensions(moving Macintosh HD/System/Library/Extensions/AMD* (any file with AMD) to a new folder. The graphics are slow with green vertical lines but better than just a gray screen) . Note if you update your OS it will reinstall the GPU kernel extensions and it will not boot again. Non baking method: Ok I have read about baking the GPU and i didn't want to go through the hassle of taking the GPU out of the iMac. So when your iMac is "stuck" in the boot up mode this is what I did. Lay the iMac down screen side down and wrap in a blanket and block all the air vents with a blanket. The idea is to heat your iMac up so hot that it shuts off. I did this overnight and the next morning the iMac was still...
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