My LCD TV/monitor developed an annoying problem about a year and a half ago. Intermittently (the most hated word in tech support) it would start zipping through the on-screen menus as if someone was pushing the MENU button over and over. Initially, I thought something was sitting on the remote, but eventually it was clear it was something wrong with the monitor.
It's out of warranty, and it's actually the third one I've had because I replaced it twice when it WAS in warranty. (Lessons: ViewSonic's customer service sucks, and never buy a big-screen without an on-site service plan.) Anyway, it was annoying, but not critical. I looked into replacing it or paying to have it serviced, but being an impoverished student, I promised myself that I wouldn't spend any money on it unless it started doing it all the time.
Then it stopped. I don't remember when, but probably about 6 months ago. It took me a while to realize it was gone. Good thing I didn't waste money on it, I thought.
Then it started again, right at the end of the semester, which was particularly annoying when I was trying to type. But it was still intermittent. I tried...percussive maintenance and wiggling the buttons (you don't want to know how many stuck CTRL or ALT keys I've seen in my line...) but couldn't make it stop. The frequency increased until yesterday, it was almost constant.
Then I noticed that if I held down the ENTER button on the set, the menu turns off.
One piece of duck tape later: problem solved.
(This solution isn't perfect; the set won't go into power-save mode with the ENTER button down, so I have to remember to shut it off manually, but that's probably a good thing anyway, both energy-wise and because I'm less likely to watch TV if I have to get up to turn it on.)