19" Samsung 2nd display has "wavy" lines

I bought a Samsung SyncMaster 906bw as a second display for my 24" iMac. I have it connected via the included VGA cable. The displays resolution is at 1440x900 with 60 hertz.
The problem, is that there are wavy lines continuously moving up the display. It's kind of hard to explain, think of those bars moving up a CRT display when they are filmed on video. I've tried adjusting the resolutions and hertz, but no dice. Any idea what could be the problem? Is it the display, or the video card?
24" iMac Mac OS X (10.4.9) 30 GB iPod Video

This page has a solution:
http://ezinearticles.com/?Lets-Resolve-the-Frequent-Troubles-of--LCD-Monitor-Our selves&id=82112
"Wavy lines on the screen:
In some instances you may encounter wavy lines on the screen. These are usually 1/4" thick and move in a vertical motion. This is caused by a noisy electrical feed from a wall outlet. If you change your vertical refresh rate under display properties to 75Hz this effect should disappear.
Don't forget to mark your question as answered.
I bought a Samsung SyncMaster 906bw as a second
display for my 24" iMac. I have it connected via the
included VGA cable. The displays resolution is at
1440x900 with 60 hertz.
The problem, is that there are wavy lines
continuously moving up the display.

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