Wavy screen on a new mac mini

When I connect my new Mac Mini to my Dell computer monitor it shows a wavy screen.  I took the mac mini to the apple store and it checks out along with the apple cable that connects the IBM cable to the mini.  It worked fine with a different monitor conencted to the cable and mac.  The monitor in question also worked fined when connected to another computer.  I have used tech support with no success.

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