It's an HP. When I move the monitor it will start back working normally, for a short ime at least.

jim, January 2008

i had the same problem but unfortunately i must have pressed on it too hard and it went completely,so be careful,anyway i think you may have a loose connection,if you can download a service repair manual for that particular model,it will show you how to remove the screws and also what to look for,i never found the time to check for a remedy and regret it now,good luck tho.

heybeth, July 2008