I have a Proliant ML330 G3 that randomly shuts down after running form any from 10 to 15 minutes. I have replaced everything except the dual Xeon 2.40GHZ processors. New power supply, new hard drives, new memory. new motherboard. I power up the machine it runs about 10 minutes, the status lights on the board are all green and then I will hear an audible click and the thing shuts down. Any ideas?