Usually it's the video card which allows you to change the display properties not the monitor, the monitor just changes the shape of the display Vertical/Horizontal holds etc. red, green, blue contrast and so forth. I probably don't have the definitive answer but here is my advice. I would suggest that you find the name and details of your video card, then find the latest drivers and possibly any applications that come with them. You should be able to download them from the manufacturers website.
I hope this is of some help
Regards
Pete