Video Card Troubles

[hndsmpete0]

Well i need some help with my video card. i had an evga 7950 go bad on me in 3 months after i had sent them my 7800 when that went bad, both from artifacts, unstable etc. So i get my new card monday, and it wont wake the monitor out of sleep. Thought it was doa, so i had them send me another one, and this one does the same thing. I dont think i could get 2 doa cards in a row. I cant telll what is causing the trouble, because when i use my pci ati9200 it works fine. I think its either the mobo or the psu. I have te asus 8n32sli delux, and an antec true power II 550W. Any idea guys?