amd epyc

Hi world, It' a classic: Power on, the fans run up but it doesn't POST. The Q-Code is 00. I waited for hours because of possible Mem-Training but no change. Asus ESC4000A-E10 (all (power)cables etc were pre-attached, as usual with these systems, they all seem to sit tight) 1x AMD Epyc 7543P...