Dell 23" monitor display Brown instead of black - ST2320L

Hello,
My monitor started display anything black as a dark brown color while other colors look and seem fine, this happened after this blue menu had popped up most likely the programming menu, here is the picture of the menu: Image may be NSFW.
Clik here to view. and this is the picture of the Brown:http://i.imgur.com/7V0Vpi8.jpg