Poping up settings automatically

I own a Viewsonic E70 CRT Monitor 17" (white) for almost 4 years now. It was given to me by my brother but not after using it for quite some time. Now the problem is that the Adjustment Screen Menu of the monitor constantly pops up and move on it's own. I tried several times to exit the menu but after exiting, it will just pop-up again. I already tried restarting the pc, booting it into safe mode and VGA mode but still the same issue. It even happens when I am in the BIOS screen. I also tried to disconnect it from the pc but none worked. I'm pretty sure it is the monitor itself that is faulty but I'm not quite familiar with CRT monitor hardware troubleshooting so can't decide on what do next. The drivers are all ok for the both the video card and the monitor. Please advise me fellow techies on what to do. Is there anything else that I can do or Do I already need to replace the monitor itself. Please help. Thanks!