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Jun 7, 2015 1:45 PM in response to stacymoore1by Jason L,Hi there stacymoore1,
Welcome to Apple Support Communities.
It sounds like there's an issue changing the resolution on the external display that's connected to your MacBook Pro. The article linked below provides a lot of great information and troubleshooting tips that will resolve most issues like the one that you've described.
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
Take care,
-Jason
