Blank screen with remark

[dhanrajkamble2011]

My lg monitor is fhd , i changed resolution to 4k,then screen is bank and "d-sub out of range" is showing remark

Configration is 6th gen. i3, 4gb ram and windows 10

Pls help me

 

[Darkbreeze]

Full HD means 1080p, not 4k. Your monitor does not support 4k. Likely, if you changed the resolution and it won't change back, you'll need to go into Safe mode and change the resolution to 1080p, then restart. In some cases you can "fake" it with a virtual resolution, but it looks terrible to me and I don't advise it even when it's supported.

4k would be Ultra HD.