8800gtx problem

Pls can anybody help ive just built a pc and cant get my view point 8800gtx to work...
spec....asus commando,4g corsair ddr2 800 ram,antec quattro 850 psu,intel quad 6600,zalman cooler,antec p182 case , lg dvd rw...upon switching on my pc there are artifacts all though bios set up + windows xp sp2...if i load drivers from the disc windows will not boot also the same if i update drivers from nvidia.. my gtx has 2xpower connections 6 pin! ive connected both of these to my psu im stumped and new at this pls help...if more info needed pls ask ty:angst: ive checked the fan is spinning and my system is seeing it but unsure if its wired wrong...dont see how cause the cables from my psu say pci-e on them ive tried alsorts of configurations with the wiring but all do the same..artifacts:(

Looks like memory on card is dud. I'd say RMA

ty cooper 4 your reply ...sending the card back to ebuyer...gutted:confused: