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I am doing a Software Update on my Mac and I would like to close its lid. But closing the lid lulls it to sleep and cuts off the Internet connection.

How do I prevent my MacBook Pro from sleeping when the lid is closed? The display should be turned off at least.

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up vote 1 down vote accepted

The display can be turned off by decreasing the brightness all way down to zero. Additionally, the display can also be quickly turned off by pressing the key combination, Shift-Control-Eject (this is the Eject key on the top right, above the delete key on the MacBook keyboard). Closing the lid is not necessary.

I also use this Jiggler application to prevent my MacBook from sleeping when I have a big download to fetch and can't afford to sit in front of the laptop.

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What about when I need to close the lid - e.g. to stop kids/dogs/cats etc. messing with my laptop when I'm not there? – 5arx Jan 31 '11 at 13:01

I'm aware of a couple of programs that do what you're looking for:

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