RiMac: Used it yesterday (day 1), powered it on/off. Used it this morning (day 2), left it running, and it went to sleep (I guess) and now pushing the power button . . . once, twice, long time, wait a few minutes . . . (moving the mouse, etc) but it doesn't seem to want to turn on. uh . . . a mac is simple to use, right ? I did add new RAM, HDDs, and burner, but it all worked fine yesterday and first thing this morning while I used it for an hour.