My A10 7700k with R7 graphics can`t run 3840x2160 on 4k monitor

Hello,

 

I just bought LG 27UD86 27" 4k monitor, but when I set it on higher than 1920x1080 the screen goes black as if not supported. I installed the drivers that came with the monitor, checked the manual(which says 3840x2160 IS supported on AMD R7 or higher on both DisplayPort and HDMI), checked for updates on any drivers, tried my old HDMI cable, the cable that came with the monitor and bought 1 more just to be sure its not from the cable, but still cant run the resolution.

 

So if anyone have any idea what can be the problem or even better have the solution it would be awesome!

 

 

With Regards,

Bobi Atanasov