If i use dell projector with my mac book pro the imagen is darkness

when i use projector del with my mac book pro the images and fotos is darknnes
what happen
is my mac or compatibility

Hi cachirulotraumatologo,
If you are having issues with the image quality when using your projector as an external display for your MacBook Pro, you may find the troubleshooting steps outlined in the following article helpful:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Regards,
- Brenden

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