I figured it was a power supply gone wonky, so I swapped in a power supply from a dead computer (500W). System boots, I'm letting it run for a while to see if it stays alive. However, at boot up, it complains that the "card cage fan" is not alive; however, it lets me continue. Will the system processor shut down after too much heat automatically without damage to the processor? That's my main concern. I bought this comp in spring 2006. Seeing as it will be spring 2009, I think I'm still under dell's parts plan but I couldn't wait for the part since I need to use my computer.