Sli failure 8800gt

Hello,
well, i have a Dell xps 720 with an nvidia chipset on board, two 8800gt cards one from the factory setup, just says GeForce 8800gt other is a pny 8800gt both are same speed setups on gpu speed both connected with SLI bridge, when boot up both are recognized, but moment i turn on SLI both cards disable through the Windows Vista 32bit sp2 OS, leaving just the pass through VGA, until i remove a card and start over, have tried either card in master slot, same results. Perplexed,,,, 4GB total mem(4chips), Q6600, yes both power cables setup, and 1kWpowersupply,
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