Screen tearing/horizontal lines on brand new pc build?

joworld0

Prominent
Dec 29, 2017
11
0
510
Just built a brand new pc and everything is all good up until I play some games (fortnite, pubg) and I get horizontal screen lines.
with my gpu I should be getting perfect gameplay, I have everything in medium settings not even the highest.
I have GTX GeForce 1070.
CPU is Intel i5-7500.
Could it be my monitor?
Monitor is Ben Q RL2755.
I don’t know what’s going on please help me!!!