Trouble with Dell display

I have a Dell LCD display which I have connected to my Macbook with a MiniDisplay Port to DVI converter, and then a DVI cable running to the display. My computer seems to acknowledge the display, but the display reads "Cannot display this video mode, change computer display input to 1360 x 768 @ 60Hz". When I go to System Preferences > Displays > Gather Windows, I can see the settings for the Dell display. They are the correct settings, the same as above.
Is there anything I am doing wrong or need to change to get the display to work? I would not like to mirror the displays, I would like to have it as an extended desktop.
Thanks,
Collin

Ok I solved it, and I'll post how because I see this issue everywhere on the net since I've been searching and there hasn't been a working solution. The problem is with the display, not the Mac. (Should have known).
In the Dell's menu, I scrolled to Setup, DVI Settings, and changed "Source" from "Video" to "Auto"
I now see my apple's background and can use the display as an extended desktop.

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