video card 1 fan running while the other fan not running well

i have 2 problems with my video card on booting 1 fan is running fine while the other one runs for a while then stops then after 20-30 sec will run fine now thats the first problem.. the second problem is monitor no signal.. 🙁

Procie: amd Fx6
videocard: Palit Jetstream gtx 660 ti
mobo: asrock n68c-gs FX
ram: 8gb (2x 4gb) ram
PSU: silverstone modular 80 bronze 600w