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    MacBook Air powers up and works - when lid shut, but not when open!

    So my old 11-inch old MacBook Air (from 2012) has a problem: I can't power it up at all when I open the lid: nothing on the keyboard and black screen. I have tried all the keypad recovery combinations and nothing works. It's dead. HOWEVER, the moment I shut the lid it powers up! Fan goes on and...