KB and Monitor directly connected is your best bet. Ignore the IPMI.
Did you happen to reset the bios? Remove the cmos battery (if there is one)? There should also be a jumper to reset the BIOS (check the manual).
After resetting the bios, VGA output should be working. If not, it could be a faulty board.
See if you can get some beeps out of it. Remove the RAM, or CPU, and try to boot. You should get beeps.
If no beeps, then the last thing to consider would be a failed flash or bad board. For a failed flash, you can recover the bios:
Besides that... Board would be dead, and contact the seller. Something this big and heavy, the seller doesn't want you to send back - as they would have to pay shipping.