On the eve of Apple's iPod event, I doubt this will get too much attention, but here goes anyway. The iMac was running iTunes and Adium, suddenly iTunes starts skipping and nothing was responding, so I hit the power button. Then the fans hit full blast, iMac is still on. Holding down the power button shuts it off. Starting it up hasn't happened... yet. Press the power button, the ambient light sensor comes on, sometimes will fade away, other times it wont. Display stays off, and in about a minute the fans roar into full blast again. I've tried resetting the PRAM and VRAM, but no success. Not getting a chime or anything out of it.. Help?