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Why does my iMac spontaneously wake up?

post #1 of 10
Thread Starter 
I have a late 2010 iMac, and sometimes it spontaneously wakes up, usually within a minute or two of being put to sleep. Other times it spontaneously wakes up during the night. I can tell because if it's waking up from a true sleep, the wifi connection takes a few seconds to start up, but when it's just a blackened screen the wifi is instantly available.
post #2 of 10
I also experienced this problem a few times with an Mac mini. I never knew why.

Mac mini 2.53 GHz, 4 GB, NVidia's 9400M.
13" MacBook Pro 2.66 GHz, 8 GB, NVidia's 320M.
OS X Snow Leopard 10.6.8

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Mac mini 2.53 GHz, 4 GB, NVidia's 9400M.
13" MacBook Pro 2.66 GHz, 8 GB, NVidia's 320M.
OS X Snow Leopard 10.6.8

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post #3 of 10
Thread Starter 
Quote:
Originally Posted by Kali View Post

I also experienced this problem a few times with an Mac mini. I never knew why.

Generic problem with 10.6.6? Sometimes my iMac will wake up a few seconds after I put it to sleep, before I've even had time to stand up from my chair.
post #4 of 10
Do you have a sleep schedule set?
Please don't be insane.
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Please don't be insane.
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by Dr Millmoss View Post

Do you have a sleep schedule set?

No, nor do I have any software set to automatically run.
post #6 of 10
Quote:
Originally Posted by randian View Post

No, nor do I have any software set to automatically run.

I ask because I am interested to know whether the Mac goes to sleep on its own. I would test that.

Also, make sure "wake for network access" is deselected in the Energy Saver preferences.
Please don't be insane.
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Please don't be insane.
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by Dr Millmoss View Post

Also, make sure "wake for network access" is deselected in the Energy Saver preferences.

It is.
post #8 of 10
I still suggest you try setting a sleep time and seeing if it works. Disconnect any USB or Bluetooth devices or external hard drive you may have connected. You could also try reseting your PRAM.
Please don't be insane.
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Please don't be insane.
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by Dr Millmoss View Post

I still suggest you try setting a sleep time and seeing if it works.

If by "set a sleep time" you mean set it to sleep after X minutes of inactivity, that works just fine.
post #10 of 10
Good, but I made a number of other suggestions too.
Please don't be insane.
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Please don't be insane.
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