I recently purchased 2 980ti Matrix to use in Sli on an x99 Deluxe MB. I am having an issue when turning on and off Sli mode. I have a multi monitor setup. Two 1440p monitors one 3440x1440p and one 1080p monitor are hooked up to my system. When I have only three monitors plugged in I can turn on and off sli fine. However, if a fourth monitor is plugged in I get black screen whenever I turn on sli. I have to hard reset. I get an overclocking failed message from the MB but I have turned off any overclocking for the cpu and are till getting black screen locks with four monitors. Any help would be greatly appreciated.

Specs:
X99 Deluxe
5930K
16Gb G.Skill Ripjaw
2x 980 ti Matrix
Windows 10

Edit: Three displays use displayport and the other uses hdmi.

Edit2: EDIT: After further examination the issue has something to do with my PG278Q monitor. I am running an XB270HU, LG34UM95, and a Vizio M60 TV. If those three monitors are plugged in, everything works fine. As soon as I plug in my PG278Q things start getting wonky. I have also tried changing display port cables.