New graphics card no video.

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I recently got an old gaming pc for cheap off of the swedish version of ebay. It had good components and when i started bf4 it ran like a charm. Until... Display driver has stopped responding and has recovered. It had a Gtx 570 in it and the 500/400 series are not well supported by newer nvidia drivers. So yesterday i drove off to buy a used 660 i found online too. Put the 660 in, Everything boots and is running but, No video input. Checked the cables and they were in. Took the 660 out and put in the 570, worked like a charm, with video. Uninstalled everything nvidia, Drivers and folders. After that i put the 660 back in and still no video. I have an old hpz400 in my room so i tried if it worked with the old Quadro fx 380 thats in there. It booted up and showed video. Put the 660 in the hpz400 and it booted up and ran normally but still. No video. I need help, what could be the problem? Dvi port broken on the 660? Thanks for any help.
 
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620 Watt silver power. It's 80+ Bronze.
I did plug the supplementary power in and i don't think it's the power supply because the 570 needed two sixpins.
 
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Me again! I just tried plugging the hpz400 with the 660 in to my tv with an hdmi cable and i got video on screen. Does this mean that the DVI port is faulty? Should i call the guy that sold it to me up? I'll check tonight if i can install drivers and such.