I would take everything out of it execpt what is needed. Check everycable and switch and chip is secure. Make sure your powersupply isn't set-up for european ac. Try a different outlet. Then try booting again. If you can't even get into bios i'd look into a new motherboard. But I wouldn't rush for that one, any1 else?
My computer keeps shutting down on its own. I put on a liquid cooling system after several heat sink and fan combos did not work and it still does it.
When I start it up, it powers up for half a sec then shuts down, then after a sec, it starts back up on its own. I thought that might mean not enough power, so I put on 100 watt larger power supply.