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TUF Z790-Pro board problems with booting, yellow Q-LED misbehaving, help needed

Level 7

I need some help with a new PC I've built with the following components:

  • CPU: Intel i7-14700K
  • Main board: ASUS TUF Gaming Z790-Pro WIFI
  • RAM: G.Skill Trident Z5 RGB DDR5-6800 CL34-45-45-108 (2x 32GB)
  • GPU: ASUS TUF Gaming GeForce RTX 4070 Ti 12GB GDDR6X OC Edition

Unfortunately, the system does not boot properly. When I switch it on, the red CPU LED lights up and directly off again, then the yellow RAM LED lights on, but stays on for about 20 seconds before going off again. The boot process then stops.

If I force switch off the machine and then on again, the process starts again in the same way, 20 seconds yellow light, but then white and green and the system boots to the BIOS start screen with a notice about an error in POST and prompts me to press F1 to go into BIOS. If I just exit out of the BIOS then, the operating system boots normally. However, I cannot soft reboot, trying that starts the whole process again from the start.

The long yellow LED phase leads me to think that it might be something with the RAM. The RAM sticks are installed in slot 2 and 4 as instructed by the manual. The RAM I'm using is certified by ASUS for the board according to their website.

I have tried with a different pair of RAM Sticks (Corsair Vengeance DDR-6200) but the effect is the same.

I have also noticed that the RAM is detected as "DDR5-4000" on the BIOS start screen, and also in the main BIOS as bot 4000 and 4800. I have enabled "XMP", then BIOS lists it as 6800. I hope this is the right way.

Is it possible that the main board is defective? On occasion, the boot process also stops at the white LED. Or do I need to change something in BIOS I do not know about?

I'd be grateful for any advice