Hello, I recently purchased a second 8800 gts 640mb video card to work in sli with my current one. When i connect the card in sli or by itself in the same slot my older card was in and turn on the power then computer will switch on for about a second then switch back off again. If the press the button again the computer wont even switch on at all until i take the card out.I cant understand what is causing this unless the card is faulty. I have a 700 watt power supply which should be sufficient for both cards and more than enough for the newer card by itself so i dont think the power supply is the problem. Any help will be greatly appreciated.