I had my first build up and running, with the OS installed and everything for two or three days. Now today I went to go do something and when I got back both of my monitors were idle. The power button wouldn't shut the computer off so I had to shut off the PSU. When I turned the entire thing back on the exact same thing happened. The motherboard is getting power; the APU fan is running, however both monitors are blank and, since I can't see anything, I imagine the BIOS doesn't load (however as far as I can tell it might). I don't think the APU (a10 5800k) is the problem, and the CPU power slot is plugged in.
All this leads me to believe there is a problem with the mobo, but it would have had to have developed while the computer was running and nothing was being moved. Is there anything I can do to further diagnose/fix this, or should I take it to a repair shop?