Hello, I've installed a new GPU - ASUS GTX 560 Ti. I have a Corsair CX 430w Psu, when I start the PC on I can see that the GPU fan is working well one of them but I'm not sure if both of them should because I heard the gtx fans work in turns or some thing like that. But anyway when I start it up I get a NO SIGNAL sign. I've tried everything for 3 hours. Can someone please help ty