This pc stopped booting. I thought it was the P/supply but a new one gave the same results. I've narrowed it down to the 4pin 12volt wht plug on the MB when this is plugged in I get nothing just a grn lite and when I push the on button a slight movement of the fan and nothing else. but if I leave it unpluged the fan spins and the HDD get power but no MB boot. a new PS did the same thing. this is a SATA system. MB # D945gtp aa # is C97839-205. Do I have a short in the CPU? what sort of test can I do on my own? Thanks mar