Sounds like you have a display driver issue. Uninstall and reinstall your video card drivers. Make sure you run your windows updates as well.
The issue is not hardware related, so start with what I mentioned and come back here with the results.
But my windows has a glitch where it will not update.. and when using the moniter (1999) it works fine... I need to figure out what wrong with my windows first 6 hour dell support conversation incoming