Hi, these are for minimum post: PowerEdge R715Minimum To Post· Motherboard· I/O board· Risers· CPU 1 w/heatsink· 1 Power Supply· 1 DIMM - Slot A1· Control Panel If you still can't get your system to post with above, it means it's most likely you have an issue with one of these parts, I'm afraid. Hope this helps.  
The server powers on and i see the hard drives light up for a brief second....but no POST, no video no nothing.... I've re-seated all of the drives, the memory, and the cables attaching the drives to the motherboard and backplane (waiting the 2 minutes to power on after I've put the power cables back in) I've re-seated the power supplies I've tried in order the steps here including removing the drives and the optical drive before powering on and still no luck:     any suggestions to resolve are appreciated - thank you
PowerEdge R715 server won't POST - no lights on the hard drives except for a 
quick flash when i turn on the power