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Dec 3, 2014 10:17 AM in response to AnBalby pedro d,Hello there, AnBal.
When working with External Display with your MacBook, the following Knowledge Base article provides some very useful information:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
In particular this section may be useful for your particular issue:
How do I select additional resolutions on my display?
You can use the Display pane of System Preferences to specify how your display works. Not all options appear for all display models. By default the best resolution for your display will already be selected in System Preferences.

To select a different resolution, use the Scaled option. Some additional resolutions may be available when you hold the Option button.

Helpful related articles
These articles may offer additional assistance and information about displays and video adapters:
- Apple Portables: How to use your computer in closed lid mode with an external display
- Apple Cinema Display (30-inch DVI) has 1280 x 800 as the maximum available resolution
- Mac Pro (Early 2009), Mac Pro (Mid 2010): Supported display configurations
- For assistance with Retina displays, please see Frequently asked questions about using a Retina display.
If you tried all of these steps for your display and the video issues persist, contact Apple technical support or take your Apple computer to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.
