Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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.

share|improve this question

Resetting PRAM and NVRAM ( is apparently a method. But simply restarting the machine seems to be the first method to try and may actually solve the problem. :)

share|improve this answer
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 :)

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.