I just remembered that Tony has seen this no display issue with his 8800 gtx's, he got around it and got it all to work again, but I think he had more vga's to test with and rectify. Most likely to me is the PSU. He is on holiday ATM and will be back in a couple of days.. In the meantime you can rma if you wish.. I cannot help further as I am not running the board at present, I will be up and running soon hopefully.

regards
Raja