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Contribution d'origine par : Darrell Lindsay ,

Texte:

PRAM reset is the only thing that has worked for me when I’ve had this issue.  For those who haven’t done that before, these are the steps:

#  restart

#  as soon as you have a black screen (before the power on ‘ding’), hold “command” + “option” + “p” + “r”.

#  allow the machine to restart for a second time.

#  release the keys.

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