HD support for 23" cinema display with a 20" intel Imac?

By using a 23" HD cinema display as a second monitor, will it still do HD even though the 20" intel Imac does not show HD? Is there anything special I need to do enable HD in this configuration?
imac 20" Mac OS X (10.4.8) dual 23" HD

I just received my intel 20 in IMAC and tried to hook it up with my 23 in cinema HD display. The display looks awful - lots of flickering, very grainy, all pink and blue. Thought it was the adapter (DVI to mini DVI), so I changed it. Tried clicking the "detect display" button, tried resetting PRAM, changing resolutions, all with no improvement. Plugged the display back to my old powerbook 15 in and it was picture perfect. My IMAC also has an upgraded 256VRAM. Am I missing something? Any recommendations are welcome.
Imac5,1   Mac OS X (10.4.7)  

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