If it's still under warrantee try taking it back. I have a Siemens Nixdorf 21" monitor and when I hook it up on my laptop it does the exact same thing when I set the resolution to 1024x768 or higher. At 800x600 it is perfect. Hooking it up to a desktop though it works great at all resolutions so I'm not sure if that has anything to do with the graphics the computer actually brings out. Unless you have more than one computer though and it works okay on the other, I suggest you get it replaced [img]smile.gif[/img]
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