Black screen on new PC

Hejeh1

Commendable
Sep 2, 2016
10
0
1,510
Hey guys, I have build a couple of PC's in my life, but I cant figure out whats wrong with my friends PC. He build it himself without any experience, so im not really sure if he did something wrong, but I have taken a look at it, both 24pin and 8pin to motherboard are connected and we tried 1 ram stick instead of 2.

Is there anyone who knows what we could do to fix this problem?

SPECS:
i5 6600K
PNY Geforce 1060
Asus z170-p
Corsair vengence 2x8 3200Mhz
Corsair CX750M