It probably tried to go to "energy saving mode" and did a shutdown instead.
Maybe try to change powersavings settings from S1 to S3 or vice versa, if that does not help make a backup of your install. Then install OpenHaltRestart.kext from Psystar.
By the way i have to start my Hack with the power button to wake it from sleep/hibernation. So did you check if it was off or only hibernating?
It could have been. I never saw the BIOS screen.
Thanks for all your help.
I have EFIStudio now like the thread said, but how do I go about getting all of the support for my GPU?