I know this topic is used a lot, but each have a unique problem; like mine... My dad's PC can not stay on line for more than 5-15sec at a time. I have ruled out the PSU (I got a new one) and anything that requires drivers. The only thing that is plugged into a mobo is mouse, keyboard, monitor, 1 ram stick (stick is OK I have 2), CPU, and NO HDD (the PC is not on enough to show me "no os found". I have feeling that the CPU is going out. Any thoughts?