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Left MacBook Air on charger overnight. Awoke to find hard drive or cooling fan revving nonstop at high speed, but the laptop won't boot up. Disconnect the charging cable and the revving stops completely, but the computer remains dead.
What would cause this and what, if anything, can I do about it?
Thanx.
[Re-Titled by Moderator]
Please try all 4 suggestions.
Please try all 4 suggestions.
MacBook Air is not turning on
