HELP. Gpu fans running at max speed all the time.

Sep 6, 2018
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Hi guys, I recently bought an used pc by a friend at a good price, it runs perfect, the only thing is that it's so noisy, it has an gtx 760 2gb gpu that runs his fans at max speed when I start up the pc. I searched these problems on google and people resolved it with softwares like speedfan, evga precision x, msi afterburner etc. but it don't works for me. In evga precision x the gpu fan rpm it's at 0.

If it can help:

Asus z77 pro3

cooler master hyper 212

corsair cx750

gigabyte gtx 760 oc 2gb gddr5
 
I flashed the vbios to a newer one, but again, nothing changed. Yes it looks like it's a straight 12v, where i can find the fan speed sensor or how can I fix it?
It's really noisy and my gf can't deal with it. 🙁