2nd monitor "cannot display this video mode" HELP~

[nateluk]

I recently built new PC and am using r9 280x on windows 8.1

Windows detects that I have 2 monitors however the monitor itself displays a message

"cannot display this video mode optimum resolution 1920x1200@60hz"

If I change the resolution to 1920x1080 it works fine. and hten if I change it back to 1920x1200 it also suddenly works fine
HOWEVER
when I reboot my PC it then does not work on either of these resolutions and I need to repeat the whole process again for both monitors to work.

HELP

 

[scout_03]

what is the resolution settings of monitor on they should be set the same and try to interchange 1 from 2 .