Solved Frustrating power cycling issues on new build

My son and I recently built a fairly high end gaming machine, our 5th build over the last few years. This time we are having an issue that we have never had previously. When the machine is turned off completely, i.e. overnight disconnected from power source, it power cycles between 5-6 times then boots up OK when powered up in the morning. The motherboard shows code A0 after bootup. The GPU has two flashing red led's that stay on all the time (including when the PC is powered down but still connected to power.
After it goes through this power cycling the PC seems to function normally other than the GPU flashing led lights. All the tests on CPU etc seem to show no problem, it works great once the cycling finishes but obviously something is not right. This is still happening even after we replaced, like-for-like motherboard (ASUS Hero XII wifi) as we thought this might be the problem although obviously wasn't. We have run memtest, all OK, unplugged and reconnected everything, reseated CPU. It is becoming very frustrating as we can't seem to come to solution.
Any ideas would be most appreciated!

Asus ROG Maximus Hero XII (wifi)
Corsair HX1200i PSU
i9 10900K
ASUS Strix 3070 OC GPU
Corsair Water Cooling for CPU
Corsair Vengeance RGB Pro 32 GB (2 x 16 GB) DDR4-3200 CL16 Memory

Cheers

veeg said:

Hello

Is the bio's up to date?

@Bruce @georgeks

Click to expand...

Hi, thanks for reply. Yes, the issue occurred both before and after bios update. Cheers

Many thanks, will do that

SOLVED- duff PSU