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Helpful answers
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Jun 30, 2016 2:57 PM in response to rickyvby Odan88,I have a MacBook Pro and exactly the same problem.
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Jun 30, 2016 3:06 PM in response to rickyvby dialabrain,Try resetting the SMC…
Reset the System Management Controller (SMC) on your Mac - Apple Support
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Jun 30, 2016 3:08 PM in response to dialabrainby Odan88,I already tried this but does not work.
The only thing which works is a complete shutdown. Plug in Superdrive and boot.