PNY 9600 GT no video out at all...please help

Hi all, I've been through a two month process of h**l trying to get this card to work. (Turn on computer, no post, no video out at all on either card output). Bought a 9600 gt made by PNY, cannot get card to work at all. No video output at all. Originally told by company that my powersupply was insufficient, upgraded to 750watt power supply on single 12v rail, has about 62 amps...enough to power a small city, still card will not put out any video. Thought card was bad and was RMA's a new one/returned my old one, still no working card. I've jumped through other hoops such as upgrading BIOS and making sure I had PCI-express selected in bios(My bios only allows three choices, pci or pci-ex, or onboard video...i have pci-ex enabled). I only have one PCI-express slot on my motherboard, but I know the slot works because my old card (a 7300 GS) works just fine and it is PCI express also. The card seems to be seated fine, and I've reseated it about 100 times with no luck, fan comes on fine and 6 pin power is plugged in back also. I really don't know what else to try, was hoping someone here could point me in a new direction at least. PNY tech support is worthless, even tried a local computer shop but they didn't know what they were doing I think(seem more interested in sales than repairs). PNY basically swore it was my PSU, so I spent almost as much on the new PSU as the card is worth and still don't have a working card...even more frustrating, my old card works fine in the same slot. My machine is an HP a1540N and only has a hard drive and a CD drive as the only other peripherals so I'm not sucking a ton of power otherwise. I've found a few other threads on similar problems but none seem to have any answers, just the same question. Open to any advice, thanks in advance.