Hello! I bought a minidisplay PORT to VGA adaptor and I had two problems.

Today before my presentation I had two problems with the adaptor: first one, part of the mac`s screen was cropped and the second one, after restarting my mac, the initial screen (with the apple logo) was also cropped. And it is still this way.
Could anyone help me ? I would be really appreciated.
Regards, Guilherme.
OBS: MacBook Pro Retina Mids 2012 15"

Hi guilhermefg120,
Welcome to the Support Communities!
The articles below may be able to help you with this issue.
Click on the links below to see more details and screenshots.
OS X Mountain Lion: About the Display pane of System Preferences
http://support.apple.com/kb/ht5369
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
http://support.apple.com/kb/ht3382
Cheers,
Judy

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