If you see Built-in Display : Nan-inch (0 x 0) while connected to another Mac on the network, it is indicating to you that the GPU or iGFX can not see the attached display as with the example below. To fix it, check all the cables and power status.
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Technology Support Specialist at Sipylus
About The Author: Stephan Pringle is an Information Technology Support Specialist. He covers hardware and software and provides tips for you to troubleshoot and repair issues on your own. In his spare time, he writes articles about the State of New York on his Hackintosh and HackBook and that has helped him to become the top contributor of the New York City section of Yahoo! Answers.
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