Earlier I replaced my CPU with an i7 7700k and cleaned out my GPU since it had been a while. Now, when I turn my pc on it automatically turns back off after a couple of seconds then turns back on, and there is no display. Everything in the pc is running and all of the lights are on. Also, I tried out my old cpu and a different graphics card and it didn't work with either, and all of the pins on the motherboard are good. I would appreciate any help. Thanks! *this my first time posting btw so im kind of a noob 
