If you want to really prove (or disprove) the overheating theory, take the cover off and put the machine where you normally do. If there's no problem, overheating sounds like the culprit. You might be able to put in an additional fan (depending on the case style). That would help reduce the problem as well.

Upgrading the power supply can't hurt, either. I'd put at least a 400 watt power supply in there, too. The requirements may only be for 300 or 350, but a little extra capacity may be useful later... [img]smile.gif[/img]