Why can't my flat panel monitor display thisvideo mode?

Q: I just got a new lcd flat panel monitor but when I plug it in and turn it on it says it cannot display this video mode. How can I fix this? It is a Dell Ultrasharp if that matters. Thanks in advance.

A: plug in your old monitor, change the resolution to 800x600 then go back to the ultra sharp and see if that works? maybe change the refresh rate too just in case, make it 60GHz

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