Unplug the power cord, and open the case and remove and reinstall the motherboard battery. This will reset the bios. Then plug it back in, and fire it up. If this doesn't work, you can try a different ps when you save some $$. You may find a cheap one on craigslist. Try to find a used seasonic, fortron fsp, enermax, antec, ocz, or corsair; these are quality brands. If the power supply change doesn't work, then the board is probably dead. And you may want to decide if you have the ability to change out the board or search for another system.