Missing resolution lines system preferences-- display

Hi,
I've recently got a mac mini which I've got hooked up to a Samsung syncmaster 205BW (which has a native resolution of 1680x1050)
Initially when I set it up I had no problems getting that resolution set in Mac OS X, however I've put it on a KVM with my other machine and now I'm having trouble setting the resolution correctly.
When I go into system preferences --> Display, the resolution I'm looking for (1680x1050 60Hz) is not on the list.
I'd appreciate it if anyone could point me in the right direction for how to add this resolution to the list.
Thanks
Rory

I have some questions for you. When the mini is hooked directly to the Samsung, is the monitor detected as "Syncmaster" or by some other specific name within Displays preferences? If yes, then when you insert the KVM between the Samsung and the mini, do you notice that the monitor is no longer identified that way and instead carries some generic ID like "VGA Display" or some other generic name? If the above is the case, that means the KVM is interrupting the plug-and-play data channel connection which is embedded in the video cable. You will need to resort to 3rd party software (DisplayConfigX or SwitchRes X) to manually configure the missing timings you desire. Either that or return the KVM for a better one that works right and is plug-and-play compatible.

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