|PC = Asus P5QC motherboard with a Q9300 CPU, 650w PSU and 4gb DDR3.|
PC has been running fine for nearly two years (apart from one format a few months ago due to bad data and to upgrade from Vista to Windows 7) and has been fine lately.
I was watching some BBC iPlayer last Friday and fell asleep with it still on. Woke up and the monitor had gone into standby (orange LED) and I was unable to wake it back up to shut down.
I held the power in for a few seconds to power off and attempted to restart. Powers on normally but doesn't beep at all and the monitor immediately goes back to sleep. All fans seem to work as they should so I cannot determine whether it's my PSU, system board or CPU. When powered on also, it sometimes shuts off after a few seconds only to start up itself again and stay running the fans. The motherboard light is on (green). However, this does not happen every time.
Tonight I'm going to try it with one stick of RAM at a time and also try a spare (albeit only 350w) PSU I have lying about.
Any other suggestions before I start replacing parts, willy nilly?
NB: There have been no hardware changes lately and no major software changes other than installation of a video player that comes with BitComet.