Just a quick question for some opinions but I think I know the answer, I had a pc with no power so changed the psu but still no power, checked all connections and tried bypassing the on/off switch but still no power so decided mobo was faulty. I replaced the mobo but still no power, tried another psu and no power, suspect new mobo may be faulty. I have checked and rechecked all of the connections. the mobo is a socket 478 from Asrock. Any other suggestions you guys may have would be appreciated.