20" iMac and external Dell 24" : doesn't work with Mini DVI to DV adapter!

Help! My lovely Dell HP LP2475w 24" Monitor can't be used as an external monitor. The native screen resolution is 1900x1200 60Hz. The Apple site claims the iMac is capable of being able to output this resolution.
When the HP is plugged in via the apple mini to dvi adapter a (tested) DVI lead, it recognises the monitor, but can't bring it to life. Just an occasional flash. In the resolution listing for the HP, the native resolution 1900x1200 isn't listed.
Plugging a cruddy old 20" Samsung with the same DVI leads works with no problems.
I NEED to use the HP for my Photo editing, and phone calls to Apples support have proved fruitless.
Does anyone have a 20" Intel iMac and an HP LP2475w set up that works?
Many thanks for any help.

I'm glad you got it working!
So do you have it working at full 1900x1200? I've noticed a few more oddities about my iMac on this monitor. First off is that initially I could only go as high as 1680x1050, which I think is the native resolution of the iMac. Now I actually see two more options, one of which being 1920x1200. This surprises me since you couldn't get it to a full 1920. Both resolutions produce the same size image on the HP, but the 1680x1050 is fuzzier. It's odd to me, same dimensions just a little less clear. I can stretch that using the HP's settings to full screen, but I cannot adjust the 1920/1200 image even though there is a black border around it.
Can you tell me what color settings you have on the HP? I have really struggled to find something I like. I actually like how things look in my iMac, and my MBP. I can't get things to look the same on the HP. I also feel like text is just a hair fuzzier on the HP than on either the iMac or MBP. I'm tempted to try a used 23" Apple Cinema Display, but I'm not sure I'll have any better luck with that. I mostly concerned about the image quality when I use my laptop, and for some reason I'm not getting great results with the HP or Dell externals that I've tried.

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