Graphics card not showing in device manager, and the drivers won't install?

[Oliviajane]

Okay I recently upgraded from a GTX 610 to a Nvidia geforce gtx970. I've plugged in every single wire, I've made sure its seat perfectly, and everything. but for some reason it won't show in the device manager, or won't let me insteall drivers, its saying that it could not find compatible graphics hardware. I've got a power source, CX750M, and my motherboard is a, gigabyte GA z77 d3H.
I have an Intel(R) Core(TM) i5-370K CPU @ 3.40GHz, 4501Mhz, 4C
Please help me I'm begging

Also, its lighting up, everything is on with it, the fan turns on briefly when the computer is turned on, but then turns off, which it is supposed to unless it gets hot I think.

 

[Oliviajane]

I've been doing this for 8hours now, I'm about to just plug in my gt 610 and say screw it

 

[Benab3]

one more thing, you could try the other Pcie on your motherboard.

 

[Oliviajane]

Nah I tried the other pcie, it only has 8slots ant it won't recognize so. I'm just going to buy a new Motherboard/Processor.