Originally Posted by denis280
what kind of connection are you using.the wire could be defect
Agreed, try a difference cable if you have one. I had a monitor (Samsung, 226BW I believe was the model) that did this to me as well. I eventually narrowed it down to only happening on one computer, Then to only happening over DVI, then finally narrowed it down to the actual DVI cable. Replaced it and no more problems.
If you are using DVI, maybe try VGA for a while (or vice-versa) to see if you can narrow it down to a particular video card output / monitor input / cable?