So it's my bro's pc. Again.. It isn't POST'ing. Monitor remains on standby. I removed all his RAM and the pc doesn't even beep! I removed his graphic card, onboard video doesn't work (it used to work some months ago when his graphics card got faulty and I tested onboard video. In fact, he had spent weeks using onboard video till I found a new graphics card for him). (When I replaced his faulty 8800GT with an AMD 4890 I had also replaced his PSU with a brand new modular Corsair 650W.) What do you think?