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crwdns2893792:0crwdne2893792:0 David Iwanicki ,

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I concur - if you get no video from both the built-in display and an external display, then this points to an issue with the GPU. You might check this Knowledge Base article and see if your unit meets the model specs for the Repair Extension Program:

http://support.apple.com/kb/TS2377

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open