Ya, no blue screen. Most of the times, the screen just go black. Audio still playing, i believe programs still running. It just black out. Its not gfx problem cos I got change before. I always have a slight hunch could be mobo or psu but not sure how to test cos the problem comes and goes very randomly.Did urs desktop restart without any blue screen or error code? Mine happened very randomly initially without any warning and it restart more often from 4~5 hrs to 1~2hrs after a few weeks.
If ur psu is out of warranty maybe can open it up to check for bloated capacitor.
Maybe I will open it up and see.