I just got a gigabyte 78-LMT-USB3 and a AMD FX Black edition processor. I also have an XFX R9 270X GPU and when I go to turn on the power, my GPU fans spin and stop and it doesn't boot. I also tried my Radeon 4890 and the fan works fine but still no boot. Is this my PSU? My mobo? Ugh and help would be much appreciated.