I have a Mac Mini 2,1 with Lion and 2 gigs of ram installed. I have had this in the bedroom for the past couple of years as a htpc. Lately after an intermittent amount of time the display goes black and the mini is unresponsive. The power light stays on but the keyboard lights stay off (caps lock key won't turn on if I press it). I have file sharing turned on and I can't access my files from my other computers. My only recourse is to hold the power light and force a shut down. If I try to start up immediately I hear a short whine of the fans starting, no chime, and then it shuts down on itself. If I leave it for a few minutes the mini will start up and work until it decides to shut down again. I've run AHT and the quick scan revealed no errors. When I tried to run the extended test, the mini quits on me in the middle of the scan. I've tried resetting the SMC and PRAM. All I have plugged into the mini is a dvi cable and 3.5mm audio cable. Mouse is bluetooth and I've dug up a microsoft usb keyboard to help with diagnosing this issue. I've tried a clean install of lion and it seemed to work better for a couple of days but that could have been my imagination. Any help at all would be greatly appreciated! Thanks in advance.