3rd Party External Monitor Resolution Limited Macbook

Hello,
I'm trying to use my Dell 2407WFP with my new MacBook via a Mini DisplayPort to DVI adaptor. I can't get a resolution higher than 1600x1000, which is smaller than the native 1920x1200 of the monitor.
The MacBook lists three screen resolutions in the 'Monitors' list, 1600x1000, 1600x1200, 1920x1600.
Any suggestions would be very much appreciated.
Thanks

Check out this thread:
http://discussions.apple.com/thread.jspa?messageID=5499693&#5499693
It's not the same monitor as yours, but it is about a Viewsonic monitor doing something that sounds very similar. Unfortunately, there is no conclusion to the thread. Can you return the monitor for another brand?

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