My macpro does not recognize an external display

my macbook pro does not acknowledge or recognize when I pulu in an external display.  It used to recognize it.  I have had this computer for 3 months.  What should I check for?

Hey pdgrobs,
Thanks for the question, and welcome to Apple Support Communities.
The following article provides relevant troubleshooting information for your issue:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Thanks,
Matt M.

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