I've got a Quad 3.0 made in August 2006... the video card in it seems to be bad. (Blue Verticle lines and hangs during boot.) I can't really seem to find a straight answer about what card(s) I can put in it. FOR EXAMPLE... do I REALLY have to spend 500$ to get a nVidia 8800 or 'Apple Brand' ATI x1900? Really? I tried a 9800GT, but no luck... the supplemental power cable that comes with the card is a little tiny 2-pin thingy, and of course the Mac Pro 6-pin connectors are all I can find to plug into. So I don't even know if the 9800 would work even if I DID have the right cable. Please help... this is my working computer, and if I HAVE To spend a huge amount of money on an Older model graphics card, I will... but PLEASE... that makes me feel so... small. thanks! matt, so?