how do i fix this?

[carlosserpas93]

white horizontal line on my screen when set above 120 hz.
cpu: i7 6700k
Gpu:MSI gtx 1080

 

[rgd1101]

MERGED QUESTION
Question from carlosserpas93 : "white horizontal line"

what is the cause of a white horizontal line that began to appear on my monitor 1 week after buying a new gaming pc,monitor is new aswell but i found it strange that when i plugged in the hdmi the line was gone as opposed to the display port, my pc has a 6700k, gtx 1080 msi, monitor is an acer predator xb1.when i overclock the monitor the line appears clearer at 144-180 hz, but below that its barely visible. is it a gpu problem, or maybe the cable displayport?