I would pull the board battery to reset the bios; also pull out and reinstall the 24 pin atx connector from the power supply if the bios reset doesn't work. Then you'll have to troubleshoot; disconnecting devices one by one to see if one has failed, starting with the optical drives, then the hardrive. I always change the power supply after a hardware failure; you should have paid your bill on time. Would have been alot easier.