OK, hoping that someone here has a fix... Our home PC has been suddenly going into some kind of unrecoverable sleep mode or something after 1-15 min or so (Varies) for the last 2 days. Occurs regardless of activity or inactivity. The light on the PC is still on, but the screen goes black and nothing helps besides a restart. Happens in safe mode as well. Not a monitor issue, it goes to the "No input" message and still shows it's power light. I went back a week with restore and it made no difference. Stopped the auto startup of all non essential programs, no difference. Norton AV & firewall working fine and no virus messages. WTF? Help?