hmmm...
I'm not really up to speed with ATI drivers (having used nvidia for the last couple of years), but let me try and help.
Where are you trying to change the resolution? direct in display-properties, or in the ATI control panel?
In display-properties/advanced there is a checkbox next to the refresh-rate dropdown list that says "hides modes that this monitor does not support", is that unchecked? perhaps the ATI panel has the same sort of checkbox somewhere.
If all else fails you can download Powerstrip (shareware) to force a custom resolution.
hope this helps.
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