Hey everyone. Im a new member to this site looking for some help.
Before my question here are my computer specs:

Acer AMD 4000+ 64 bit dual core processor
4 GB DDR2 RAM
ATI Radeon HD Pro 2600

I have had this computer for over 3 years and it has worked very well for me. Recently, i have been having some issues. After using it for a while (usually 10 minutes or so) the screen freezes and then the computer crashes (it's still on, but completely unresponsive). I did a manual reboot. But the same problem persists. No error messages show up either upon reboot. I have checked my registry and done a disk cleanup, but there isn't anything noticeably wrong. I also opened the case and cleaned the dust, and the cpu and fans are properly sitting. I still haven't checked the power supply, as i do not have another one handy at the moment, but it is a 500-watt ps, so i do not think that is the problem. It is possible that i have worn the machine down as i am a heavy pc gamer and often run multiple programs at the same time. Any help that you guys can provide me would be awesome.

Peace

Firefly