> One way to test, if you have an external HD around, would be to install OS and boot from an external. If it runs fine, I would suspect internal drive, or possibly SATA cable.
It will start from an external (firewire) and seems to function fine but the sleep issue is still there (won't wake after an hour) even when running from the external.
> Running OK in Safe Mode does seem like a possible software/OS issue...not hardware.
That is what I figured and thought to swap out the internal drive for the external but since the sleep issue persisted I changed my mind.