No monitor signal gtx 260/275

I just bought a new PSU today

http://www.newegg.com/Product/Prod [...] 6817153077

so i could upgrade my graphics card. First i got the GTX 275 and connected everything but my monitor got no signal. i tried a new monitor and switched some cables and that wasn't it. i put in my old gt120 and it worked fine.

i cleared all drivers, nothing. i got on the phone with tech support who said my new PSU should run it fine, ran me through everything i already tried and actually recommended i get a new card.

i return it, and get the GTX 260 and have the exact same problem.

the computer boots fine, i can feel the air from the card's fan moving, but my monitors get no signal. i do not have an integrated display on my board to disable.

my computer is

http://www.newegg.com/Product/Prod [...] 6883113089

i have had no problems i couldn't fix myself up until now.

any help would be greatly appreciated

That PSU is a POS. It doesn't have active PFC, only has 70% efficiency, and doesn't have much power on the 12v rails. It's most likely that the PSU just can't produce enough clean power to run those graphics cards. I would return it for a quality unit from Corsair, Antec, Seasonic, PC Power & Cooling, or OCZ.

Here's a much better PSU that actually costs less.

OCZ Fatal1ty OCZ550FTY 550W ATX12V / EPS12V SLI Ready CrossFire Ready Modular Active PFC Power Supply - Retail $64.99 - $25 MIR + an additional 10% off with promo code OZSAVEOCT.

Powering the fan on the GPU hardly takes any power. Properly powering the GPU is another story. I would return that POS PSU whether it's actually the problem or not. Using a cheap PSU like that is just asking for problems down the road. A cheap PSU can cause all sorts of problems ranging from system instability to fried components.

i just changed the psu to

http://www.newegg.com/Product/Prod [...] 6817371026

antec 750w

same problem with the new card. i then throw my pos gt120 in and it starts up without a problem. is there something that i am just missing here??

yup, that was the first the tech support asked me too. i'm plugging the PCI-E cables directly from the psu to the card