Recovering from resolution selection that won't display

my intel mac mini arrived today. setup, including transfer of info from prior machine was a breeze. connected it via HDMI to a Sharp LCD. to explore which resolutions might display best, I clicked one that was displayed in the list but which I soon discovered was NOT compatible with the LCD TV. Now only display is "Signal Not Compatible." When I reboot, I see the usual apple startup in the TV's default resolution, but once it is started to switches to that incompatible resolution. But then of course I can't open the Display panel and change anything. A real catch-22!
I am able to startup in single user mode (holding down command-S at startup) and look around in the Library/Preferences and elsewhere. Is there a plist to delete that will stop the switching to the incompatible signal?

that worked. I knew to get rid of
/Library/Preferences/com.apple.windowserver.plist
but I hadn't found and removed
~username/Library/Preferences/ByHost/com.apple.windowserver.xxxx.plist
because looking in the ByHost directory hadn't occured to me. I was looking for the windowserver files in ~username/Library/Preferences
and one can find and delete these files using either single user mode or by using terminal in safe boot.
In any case, I'm back in business. Thanks for all the help!
Uh, this seems a problem that lots of more naive users are going to run into when they buy a mac mini for the media center. Without being comfortable with basic unix, this would be a difficult problem for the typical hom user to fix.

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