Computer won't post only black screen on startup

Roflrawg

Prominent
Mar 30, 2017
5
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510
Once I Start up my computer with no ram it turns off then on in a loop, but with ram in any slot but the second it will stay on but as a black screen with no bios.
My specs are:
G.skill ripjaws (2x8g) (ram)
i5 7600k (processor)
Evga supernova 750 (psu)
Gigabyte z170x ultra gaming (motherboard)

I also have a radeon rx480 graphics card but I can't install it till I get into the bios.