Computer start up and main screen turn off (no source) [Closed]

Report
-
Hello,

when I start my computer, both of my screens normally work up until windows loads the desktop.

At that point, my main screen goes black and says no source.
Windows still function as if the screen was working correctly, and 2nd screen does work.

Only way I found to rectify this is plug-out and then back in the DisplayPort cable, and then, voila, all back.

GPU : R9 280X Sapphire
Driver : Crimson Edition 16.11.4 - 17/11/2016


Any help appreciated :)