Aww damnnn, I just got a chance to swap out my GTX280 for my 6950 that I got last weekend. Pulled the 280, popped the 6950 in. Connected the 6 and 8 pin power leads from the PC P&C 750 PSU and powered it up. GPU fan spun at 100% (holy chit, made the old Nvidia 5800 sound quiet by comparison) and I heard a few beeps. No display. Yanked the card, reseated it, same thing.
Just contacted Newegg to RMA it, but I will test it in another rig here before giving up on it. I haven't ordered the rest of my SB build yet, but figured my eVGA 750i SLI FTW was fine to use the card in until the rest of my parts are ordered.
Edit: Tested it in another rig with an AMD board and an Antec 750w PSU - same result. Back to the Egg for an RMA.