OK when you turn on the system there is no image at all?
Does your dell have integrated graphics or is it a PCI graphics card?. Things I would try.
Disable the onboard video if it's integrated. Check all connections, check to see if the fan spins on the card when you turn on the system. Try the card in another system if that's an option
RMA if you still don't get any picture. No picture at all on a new card sounds like something went wrong during shipping. When I got the replacement for my GTX 280 it gave me no picture at all. It came DOA. My second RMA worked fine.
Yeah I agree with Saulin, it sounds as if your onboard is taking priority and needs to be disabled. Plug your monitor back into the onboard and go into the BIOS and see if you can disable your onboard video.
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