Why HDMI can not display 1680x1050 resolution?
Mac Mini and the HP 2207 monitor screen...: Apple Support Communities : "The reason it is grayed out is because the 1680x1050 resolution has no HDTV mapping so it assumes it is not hooked up to a tv. Generally connecting a computer to a computer monitor by HDMI is a bad idea. You will never get a true 1 to 1 pixel mapping like you will when hooking up by DVI. The reason the port is there on the monitor is to give people the option to hook up a video device up to it, be it a dvd player, blueray player, etc. " 'via Blog this'