Dell 2408 - MacBook problem

Brand new MacBook, brand new 2408WFP. Connected from minidisplay-vga. The problem I am having is that about every 10 minutes the display goes black and reconnects only when I touch my mouse. Very frustrating, I called Apple support and they took me through troubleshooting and determined it wasn't the Mac. I haven't called Dell yet (got stuck on hold).
My monitor settings: 1920x1200 60 Hz. When I switched down to 1600x1000 at 75 Hz, the problem appeared to go away. However I want the 1920x1200 setting. There is no way I can adjust the speed manually (other Hz settings are greyed out).
Some other tidbits
- the 2408 monitor is fine with my old PC running Windows XP
- my old Dell 19" monitor is fine with the new Mac - it's not a widescreen monitor.
- Apple says it's not their problem
Any advice?
Thanks
Sam

I have spent 2+ hours on the phone with Apple support, been escalated three times, no answer.
All of the work-arounds have failed. Found out that numerous others have this problem.
Should I return my MacBook? This is bad.

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