iMac external display, can't find way to change preference

I hooked up an external projector display to an iMac.  Then I made a setting change that made the screen black.  How do I get rid of the setting?  Safe mode allows me to use the external display properly, but when I go back in as a user it goes back to the black screen.  Is there a file I can toss?  Also, I created a new user account and it goes black on that account as well so this is a system setting issue and not user specific.
ddawsonwAsked:
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pheidiusCommented:
Get switchres x and install it. Then use its more advanced setting controls to bring back your display. http://www.madrau.com/
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ddawsonwAuthor Commented:
I am waiting on this job to startup again.  It starts this weekend.
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pheidiusCommented:
cool
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pheidiusCommented:
Switchres x would have given him more controls of screen rez to get it back
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jhyieslaCommented:
This question has been classified as abandoned and is being closed as part of the Cleanup Program.  See my comment at the end of the question for more details.
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