Mac Pro working but logic board LEDs on when computer off!

Since I'm not collector, I've placed this item for auction on Ebay: http://www.ebay.com/itm/-/141711350665

Grant Bennet-Alder: You’re assistance and perspective are INVALUABLE — and I have benefitted from your expertise both directly and indirectly HUNDREDS of times! I appreciate that you’re sticking with me here! :-)

I’ve been through the everymac.com site dozens of time; it’s a favorite! But you yourself already provided the answer: “That serial number does not look up to anything.”

That’s because it’s a PROTOTYPE; the second exterior clue is the little line below “model number and EMC number cousins” — because instead of providing a configuration summary like “MAC PRO 2.8QCX/3X1G/1TB/5770/SD-USA” — it provides BUILD REFERENCE “CFG408.”

I’ve spent 6 months searching for every answer but a PROTOTYPE — and now that’s the ONLY answer that remains! NOBODY has a device that behaves the same — and its FAR TOO COINCIDENTAL that the status lights behave PRECISELY (NOT ONE DIFFERENCE) as the Late 2009 Xserve did. Further, the unit was produced in June 2010 -- a month before the 5,1 general release... and five months before the Server release. The conclusion actually vindicates the seller, who told me from the outset that it “had previously been a server in an Apple Store.” PROTOTYPES have to be studied to be beneficial; and now it’s the collector’s turn! :-)

Oh, and BTW: My [other] Mac Pro 5,1 2.8GHz Quad Core, which coincidentally matches your everymac.com link, also has a serial tag embossed as "Model No.: A1289 EMC No.2314." Despite everymac.com's phenomenal wealth of information.... labeling doesn't always match the everymac diction.