Monitor hardware problem

I've got a DV2721nr, and the monitor seems a little loose for the past six months or so, and in the past week its starting to glitch. Today it started SERIOUSLY glitching whenever I turn it on, during the login screen (so far it only does this during the login screen) it looks like its skipping, bouncing around a million times, then looks like the color is whiting out.
anyone else ever encounter this problem? I think tis a hardware issue and not software cause if I apply pressure to the screen, it affects the glitching and sometimes (if I'm really lucky) fix it completely so I can login.I dont know what is wrong with it, so any help will be greatly appreciated.
-jason.

There is only one combination of Red, Green, Blue, HSync, and VSync that will run a high quality monitor.
When you change the switches on your adapter, most of what you are doing is changing the wiring of pins 4, 7, and 10. These pins, and their connections with wires and diodes, are read by the Mac at startup to tell what family of genuine Apple displays is attached. (The code is like a promise that a certain display is being used.)
The Mac uses this information, read at startup, to decide what resolutions and refresh rate are valid for the display you said is attached. No others are provided by your Mac, because they might damage your display.
You have been focusing on the display as the likely source of the problem. I doubt that the display is the problem. The display is a slave. It takes the rows of dots given by the computer and attempts to paint them on the screen, and adjusts the frequency to match what the computer is sending if it can, and otherwise goes blank.
If you take that same "adapter" and cable, and connect it to the Apple display, I expect you will get similar good results.

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