I got standoff and actually this mobo required to remove 2 of them from ussuqll place and there is no shortage.I reflashed old bios today and put 7551 cpu and its the same behaviour kinda on box I will make it work after 30 min reseat things and after i move or put it to case it wont boot up but its stuck on post code 02 instead 6a i think motherboard is faulty prob will rma it as with 2 cpus seems to have the same issue.
My crystal Ball said 02 is a general memory error. But that is BS.
In my experience, it happens when the PSP in the CPU fails to boot and do its job.
Which should only happen if you are using a weird ES or CPU not meant for that Board or Bios. Like Rome on trx40.
Which you aren't so the only suspicions left would be an issue with the PSU, maybe you have on for the bench and one for the case?
The one in the case being possibly faulty?
Or you have actual physical damage on the Board.
Maybe it flexes or pressures components a certain way on the bench that it doesn't in the case and hence makes it kinda work on the bench but not the case.
Never the less, it is likely a very good idea to RMA the board.
I would really like to know what caused it though, so if you hear anything, please let us know.
In case they find damage caused by you and deny the RMA, you aren't lost, just report it here.