moire on monitor - why?

[Mike S.]

A couple months ago I noticed that my 5 y/o HP CRT monitor has what
appears to be moire on the left side. In addition, the left side of
the screen will sometimes appear to be moving left and right a couple
times very briefly.

I've had no other problems with this monitor although it does now have
burn-in despite using a screensaver.

Is there any reason why the moire effects would appear and why the
screen appears to move?

 

[John Adams]

A couple months ago I noticed that my 5 y/o HP CRT monitor has what
appears to be moire on the left side. In addition, the left side of
the screen will sometimes appear to be moving left and right a couple
times very briefly.

I've had no other problems with this monitor although it does now have
burn-in despite using a screensaver.

Is there any reason why the moire effects would appear and why the
screen appears to move?

Try a different resolution and refresh rate, press the degauss button,
make sure nothing electrical is near the monitor that could cause it.