"Black Level" Setting Greyed Out

[PsychoPsyops]

Hello.
When fiddling with my monitor controls, the "Black Level" setting is stuck on high and greyed out, not allowing me to change it.
The monitor I speak of is

http://www.newegg.com/Product/Product.aspx?Item=N82E16824025066&cm_re=lg_1440_widescreen-_-24-025-066-_-Product

Thank you for your time in advance.

 

[Phillip Corcoran]

After reading the appropriate section in the User Manual I see that the "Black Level" setting applies only to monitors connected via HDMI: http://www.lg.com/us/commercial/21-9-ultrawide-monitors/lg-34UM94-P


Is your monitor connected to your PC with an HDMI cable?