When I moved my computer downstairs to download a game via Ethernet, it turned on for a second then turned off. I brought it back upstairs to make sure it wasn't the outlet, and it still wouldn't turn on. It worked before I took it down. I took off the side panel and shorted the motherboard 24-pin, and everything turned on; the fans turned on that weren't connected to the motherboard. I'm guessing this is a motherboard problem, but I need it confirmed before I send it back.