No signal using DVI cable from mac mini

I have the dell 2007wfp monitor and I can't use the DVI cable I get the message No signal coming from your computer. then the display goes to sleep.
It works OK with the DVI to VGA but everything is stretched and peoples faces look weird.
I have a mac mini 1.66 dual core with 2 gigs ram and 667 mhz DDR2 SDRAM.
The monitors max res is 1680x1050.
Any thoughts?

+Could it be that some monitors are harder on the video card/cpu?+
Yes, in a manner of speaking. In fact, Apple says as much. Some displays are "coherent" and some are "non-coherent" and they get treated differently by the mini. It says so on this Apple spec page for the mini in the second column under "Graphics and video support".
http://www.apple.com/macmini/specs.html
Of course the problem is how do you know which you have, a coherent display or a non-coherent display? Answer: you don't until you get your new mini or new display home and discover the two don't play together.

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