New motherboard sporadically stops recognizing GPU upon booting.

So i just upgraded my pc with a new motherboard (Asus Strix z270h gaming) and a new cpu (i7 7700k).

The first few boots everything was fine, but suddenly my year old GTX 1080, which has been working flawlessly until now, is no longer recognized by the pc. After reseating the gpu, it starts working for maybe 1-2 boots, but then its the same tale all over again. It is getting power even when not recognized, the LED lights on the card are active. I have tried changing pci-e slot and the problem persists.

The PSU is a 6 year old Corsair tx550m, and before i changed mobo and cpu i had a asrock 770 extreme-m and a core i5 3570k at 4.3 ghz without any problems. Ive updated the bios now twice, reinstalled the gpu drivers, and I have looked into the bios and made sure it doesnt prioritize the iGPU upon boot. What can be the problem here? Advice would be greatly appreciated.
Reply to krudus
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More about motherboard sporadically stops recognizing gpu booting
  1. The aging PSU is my prime suspect for your issues. Do you have access to another PSU that could be swapped in for troubleshooting?

    Also, do you have the most recent BIOS version installed on your new motherboard? If not, this is another typical thing to apply to resolve such problems.
    Reply to COLGeek
  2. COLGeek said:
    The aging PSU is my prime suspect for your issues. Do you have access to another PSU that could be swapped in for troubleshooting?

    Also, do you have the most recent BIOS version installed on your new motherboard? If not, this is another typical thing to apply to resolve such problems.


    I have updated the motherboard bios. Unfortunately I dont have another psu available right now, and i suppose i will have to buy a new one if this problem persists, but before i do that i simply want to exhaust all other possible solutions.
    Reply to krudus
  3. Understood. Did you install the BIOS update before or after posting your thread?
    Reply to COLGeek
  4. COLGeek said:
    Understood. Did you install the BIOS update before or after posting your thread?


    Installed before posting. Installed them twice actually to see if something went wrong the first time, but nothing changed.
    Reply to krudus
  5. Understood. Narrows down to PSU or the GPU itself.

    Are you overclocking anything (memory, CPU, or GPU)? If so, revert to stock speeds to see if the system stabilizes.
    Reply to COLGeek
  6. COLGeek said:
    Understood. Narrows down to PSU or the GPU itself.

    Are you overclocking anything (memory, CPU, or GPU)? If so, revert to stock speeds to see if the system stabilizes.


    I did load up the XMP profile on the new ddr4 ram from 2133 to 3000mhz, but reverted them just before posting to see if it would have any effect. Im afraid it didnt.
    Reply to krudus
  7. Turns out it wasnt the PSU at all, the problems disappeared when i turned off fast boot in the mobo bios. I made my ssd my primary drive with the hardware change and i suppose that everything moved too fast for the motherboard to recognize the gpu upon boot, and by the time it could it had already dismissed that slot and moved on to the integrated graphics. This is all speculation though, since im far from an expert on this. The first few times when it successfully recognized the gpu maybe was down to the update process; windows updates and other things that slow things down upon boot gave the motherboard the time to recognize the gpu, so the problem remained hidden until the pc was fully updated. Anyway, what i can say with certainty is that everything started working as soon as fast boot was disabled.
    Reply to krudus
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