I recently built a custom PC, and as of the first time of turning on, it shut itself down after five seconds. While powered on, the fans on the case, the GPU, the motherboard, the PSU and the light on the cooler were all on. There is currently no OS on the machine, but I am planning on putting Windows 7 on it via USB. As I turned it on, my monitor picked up no HDMI signal. I tried to get into the bios using two different keyboards, but failing both times. One of the keyboards used the older fashioned keyboard/mouse connector, and once plugged in, the lights on the keyboard briefly flashed, so some power is being outputted. When turning off, a red led on the motherboard flashes, before everything loses power.
Specifications:
Case: Corsair 450D
Motherboard: Asus sabertooth 990fx r2.0
PSU: Corsair RM 850
GPU: AMD Sapphire Vapor-X r9 280x
CPU: AMD fx 9370
RAM: Corsair Vengeance DDR3 2133 mhz 16GB
Cooler: Corsair h100i
Monitor: Benq GL 2450 HM
Specifications:
Case: Corsair 450D
Motherboard: Asus sabertooth 990fx r2.0
PSU: Corsair RM 850
GPU: AMD Sapphire Vapor-X r9 280x
CPU: AMD fx 9370
RAM: Corsair Vengeance DDR3 2133 mhz 16GB
Cooler: Corsair h100i
Monitor: Benq GL 2450 HM