Menu/screen resolution/contrast box keeps popping up on screen.

By what your describing, the board in the monitor that allows you to make changes to the display is going bad (sounds like the settings button). If it were a notebook you might be able to get a board replacement (just an example I know notbooks dont have this feature in the lid). Since it seems that your display is for a desktop, I dont think it would be easy or inexpensive to get a replacement board. You will probably have to get a new monitor. If you want to fix it yourself, pull the monitor apart and get the board out. Try an electronics cleaner and put it back together. If it works, great. If it doesnt, take the board back out and take the board to an electronics (tv) repair shop and see if they can solder in a new button. If that doesnt work your back to buying a new monitor. Hope this helps...