Hi, I was also facing similar issues. (no boot, no screen output, no beep, IPMI working, I've got 5VDC/12VDC at the molex plugs).
When digging a bit further, my Mobo looks like having issues with the RAM modules.
Slots 1A, 2A, 2B can only be used with 8GB modules, if I load anything onto 3A...