GPU goes full speed after I installed a new CPU

[Digzit]

So what the title says. I just recently installed a new CPU, and after that my graphics card just went full nuts 100% when I try start. The screen is all black and I hear no beep at all. I even put a layer of cooling paste on the CPU.

Specs:
CPU - AMD FX 8320 Black Edition 3,5 GHz
GPU -Sapphire Radeon NITRO R7 370 4GB GDDR5
Motherboard - ASUS M5A78L
PSU - Corsair CX 750M, 750W PSU

Same thing happened yesterday when I tried to install a 8350, except then the GPU was fine. I've been looking around to find an answer. So maybe someone here more experienced can enlighten me.

 

[Digzit]

Just want to edit that I also tried out my older components (GPU/CPU/PSU) But was pretty much same problem. So it's the motherboard? It has couple of years on its neck so wouldn't surprise me