Was hoping for some fresh input. Been stumped for a couple of weeks. I have an Acer Aspire AG3760 desktop. Vista home basic. It boots up so not completely dead, I can even get online if it doesn't cut off too quickly. But anywhere between 2 and 20 minutes I hear a faint click from the tower and the screen goes black and I get a 'no signal' message. The tower still lit up, fans spinning, only the drive light stopping is the only physical change. I cleaned out the tower, renewed the thermal paste, restored factory settings, tried two different monitors, tried a second PSU, swapped the socket my RAM is sat in as well as testing the RAM. I even had a desktop fan blowing directly into the tower. There is no video card, it's inbuilt. The mobo is a G31T M5, psu is ATX250PA, celeron 2.2. I apologise for lack of paragraphs, can't seem to do it with my tablet.