My one month old MacBook Pro suddenly does not sleep anymore when I close the lid. There might be a relation to the Caffeine program that I installed recently. Caffeine prevents a Mac from going into sleep. But I have the problem when Caffeine is not even running.

What reasons could there be for this problem happening? I'm hoping its a software problem instead of some hardware failure.


Resetting PRAM and NVRAM (http://support.apple.com/kb/HT1379) is apparently a method. But simply restarting the machine seems to be the first method to try and may actually solve the problem. :)

  • Upvoting just so it doesn't stay in "Unanswered" forever. – squircle Apr 8 '10 at 15:13

I had a problem like that when I installed Entourage on My mac.

It disappeared when I uninstalled Entourage. Not sure if that help but I tried :)

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