Alright, turns out I am an idiot.  I didn't actuate the ZIF levers and had never secured the processors into the socket in the first place. I have now moved on to a new problem:  Importing my hard disks so I can boot from them.  I will begin another thread. Thank you for all your assistance! M.
Hello, I recently had a 2800 stop detecting memory (1-3-2 beep).  I switched out the mainboard for another T7916, but I ended up with a different Rev number.  My old one was an A03, but I went and found myself with an A02.  This causes a failure to POST and an error message on the front LCD - E0780:  Processor 1 Presence.  My research appears to have revealed that the error message is a red herring, and that the real problem is the PCI riser card. The riser card I have is a M8938 Rev A01.  I can't seem to find any documentation detailing which riser cards would be compatible, however, and it would be pretty time consuming to go site-to-site and confirm if I can get an identical A03. I've only found one place selling a riser card for a reasonable amount (they're almost as much as a new motherboard if not more), but no word yet on if it is an earlier edition than the M8938 A01, which does not work with T7916 A02's, evidently.  My questions: 1)  Is the motherboard revision between A02 and A03 something that I can do via flash?  The machine will not POST with this riser card, however, so that might be a moot point. 2)  I have found a site selling a confirmed T7916 Rev A07 Motherboard.  Does anyone know if the Rev A07 Motherboard accepts the Rev A01 riser card? Thanks, M.
PowerEdge 2800 Motherboard Question