When I close my Mac Book when its on a- The display won't turn back on whe-

When I close my Mac Book while it is on and leave it on while closed for long periods of time and then I open it, the display will not turn back on- why?

Does it turn on when you do something like hit a key or click the mouse? Or do you need to restart? If the former, forget about it, except try clearing the pram/nvram. (commandoption+pr on startup till it bongs a few times). If the latter and if the step above didn't work, you've got a problem that might be solved by doing an archive & install.
Message was edited by: Jonathan Kurtzman

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