Its a new rImac and I put it to sleep at the end of the night. When I return to the computer in the morning, it doesn't wake up. I need to press and hold the power button until it restarts. I've adjusted all of the appropriate settings in the power savings menu. This is actually the second rImac I've had in the last few weeks. I originally ordered one with a 380 card, but after seeing all of the benchmarks come out, I upgraded to what seemed like the sweet spot for me- the 390 card. The first computer, with all of the same things plugged into it, didn't behave this way. The computer is only a few days old, so I might just reorder another one and see if the problem is resolved. Has anyone else had this problem? Thoughts? Thanks!