Newly built PC auto turns off after five seconds.

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
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  1. aholloway13 said:
    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

    The hardware might be incompatible.
  2. http://www.asus.com/Motherboards/SABERTOOTH_990FX_R20/HelpDesk_CPU/


    Likely culprit if you have all your wires connected is that your bios might not be flashed to support the cpu if you know someone with a chip that will work in the board swap it out and see if it works.
  3. Haeight said:
    http://www.asus.com/Motherboards/SABERTOOTH_990FX_R20/HelpDesk_CPU/


    Likely culprit if you have all your wires connected is that your bios might not be flashed to support the cpu if you know someone with a chip that will work in the board swap it out and see if it works.


    How do I go about flashing the bios so that it's compatible with my CPU?
  4. 1st find a cpu that is compatible for the board, then swap it into your rig. if it starts then you will know its bios needing to be flashed. You have to be able to get into bios to flash it so you have to make it run hence get a cpu that will work talk to friends.

    There should be instructions on that link on what to do once you selcet your chip it has a download and a link on the page for how to flash.
  5. On the website though, it says that my CPU is compatible with the board...
  6. aholloway13 said:
    On the website though, it says that my CPU is compatible with the board...


    if your bios version is 1708 or higher but you have not been able to see it post hence you may not have 1708 or higher so this means you either RMA the board or try to test it with a chip that does not say it may need to have the bios flashed to work.
  7. I RMAd the Motherboard, but now another problem is occurring. The new Motherboard I got is a "GIGABYTE 990FX A-UD3", and I set it up outside the case along with the psu, cpu, a keyboard, gpu and ram (also tried this without ram). I have the monitor connected to the gpu via hdmi, but when I turn it on, the monitor says that it is receiving no hdmi signal. When I plug out the hdmi though, the monitor lights up again, then after a few seconds it repeats the same message, saying it's not detecting any hdmi signal, and the same happens when I plug it back into the gpu. What's wrong here?
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