check all your cables make sure there tight. Move the monitor cables away from as many other cables as you can. Move your speakers away from the monitor.

 

Hi Brian: Well you were very close to guessing the problem. I took you advice and checked to make sure all the cables were tight which they were but then I noticed the location of the power transducer (or is it the transformer ?) of the new printer I just installed the same day that the vibrating monitor started. Without thinking I set this black power thingy under the back side of my monitor. When I moveded it away the vibrating stopped, I bring it close to the monitor and the vibrating starts again. I love it when I learn something new!! Thanks for the point in the right direction Brian!