Hello
I have put together a new Pc for myself
(This MB, AMD Ryzen 7 5800X, an old GTX 970 for testing, a m2 ssd and a hdd (both tested separately to rule out a broken hard drive), 2 3200mHz rams (also tested and they work).
When I tried to boot the pc (after BIOS flashback with the latest BIOS for the new processor) I have no beeps and only the green q-LED is on.
Now I have no visual output from the BIOS. Both with and without GPU.
What could be a reason that the BIOS does not boot correctly?

Question

Hello 
I have put together a new Pc for myself
(This MB, AMD Ryzen 7 5800X, an old GTX 970 for testing, a m2 ssd and a hdd (both tested separately to rule out a broken hard drive), 2 3200mHz rams (also tested and they work).
When I tried to boot the pc (after BIOS flashback with the latest BIOS for the new processor) I have no beeps and only the green q-LED is on.
Now I have no visual output from the BIOS. Both with and without GPU.
What could be a reason that the BIOS does not boot correctly?

Answer

Maybe just reset the UEFI/BIOS.
To do this, disconnect the power and connect the CLRTC pins at the bottom of the board for 5-10 seconds (manual 1-17).
Then reconnect the power and try again. 
I had a similar problem with incorrect RAM timings and was able to restart the system.

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