In case anyone has a broken one and is willing to get rid of it for cheap, I'd be interested.
EU by the way.
The standards to check, just to repeat them once more.
1: power on without ram, to know how that behaves.
2: power on with ram.
if Still the same behavior as in case 1, it is either a problem with the RAM, or not the RAM at all.
3: test with one stick and iterate through all slots. CPUs can have bad / dead channels, boards can have damage to ram-traces, some platforms have primary and secondary ram slots.
4: check the ipmi, those Voltage critical messages from page 2 can be a critical hardware defect.
5: Test with a different power-supply. As someone mentioned earlier, some boards and PSUs are picky and are working, but not with and only exactly that board.
6: visually inspect the board for ripped of components, and scratches. Especially around mounting holes.
If you happen to have a TPM Debugg Postcode card, those are damn helpful for such debugging, use it and remember the codes of each step.
If its is stuck on FF, 00, 0D it is at least for now, dead.
bX early on is Ram and Ram training.
00, no cpu, cpu dead or broken board with defective VRMs.
FF is, well a FU**en FAILURE. Some Boards don't reset Port 80 in the liking of the debug cards, making them show FF sometimes.
0D is something i'm still trying to figure out.