Geforce 660 not being detected by Assorck extreme Z77

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Here's my computer build :

I5-3570k - Geforce 660 - Assrock extreme 4 Z77 - Corsair CMPSU-600CXV2 Builder Series 80 Watt Plus Certified Power Supply

In driver managers it absolutely shows nothing other than the VGA.
I switched in the bios to PCIE and still, I get no image from HDMI,
The computer works fine except for that; I tried to unistall the driver Intel Graphic HD 4000 and for some reason it won't reinstall by itself.
The Bios says that there is nothing at the PCIE.
I made sure that every power cable is well put by the way.

Hope I gave every useful information.

Thanks in advance
 
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Yes I am sorry I forgot to mention that there is a PCIE 6 pins in the GPU and the cable goes from the monitor to the motherboard
 
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Actually, I forgot to mention that, sorry, there is no signal output from HDMI, I tried to boot the comptuer without the VGA from the motherboard but it does not work.
I did not install the drivers, it won't install as it tells me that I don't have the required materiel, as it does not detect the GPU

Thanks for the help by the way
 
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Absolutely no displaying from the card. So my best option is to use the warranty? I'm sorry it is my first build
 
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Thanks a lot, I got a new one that works but the thing is, about every 5 to 10 minutes , the GPU randomly peaks at a 100 without any reason, does anybody know why? Thanks