The Mountain Lion doesn't sleep tonight

[Dr. McKay]

Since I upgraded to ML from SL on my early 2008 imac, my mac never goes to sleep, not the display, nor the mac.
Changing energy settings does't change a thing.

Never had any issues like this in SL.
Anyone else experiencing these problems on this type of imac ?

 

[GGJstudios]

For sleep issues, you may find some useful ideas here:

• OS X Mountain Lion: If your Mac won’t go to or stay in sleep
• Mac OS X: Why your Mac might not sleep or stay in sleep mode
• Determine why your Mac wakes up from sleep
• One sleep problem caused by printers - solved ... and another
• If your Mac isn't sleeping properly and you have gfxCardStatus installed, try uninstalling it.

 

[Dr. McKay]

Thx, I'll have a look.
Still, even when I am downloading files, running iTunes, indexing or whatever, at least I should be able to put the display to sleep...

 

[GGJstudios]

Thx, I'll have a look.
Still, even when I am downloading files, running iTunes, indexing or whatever, at least I should be able to put the display to sleep...

Did you try Control-Shift-Eject?

 

[Dr. McKay]

Did you try Control-Shift-Eject?

That works (thx by the way, didn't know about that one), but it's not normal I should have to do it manually. Did work in SL, so must be ML-related...

 

[Weaselboy]

Since I upgraded to ML from SL on my early 2008 imac, my mac never goes to sleep, not the display, nor the mac.
Changing energy settings does't change a thing.

Never had any issues like this in SL.
Anyone else experiencing these problems on this type of imac ?

You might try a SMC reset.

Also try the below command in Terminal. It will show running processes that are keeping your Mac awake. Normal processes will be followed by 0 and those keeping the machine awake will have a 1.

pmset -g assertions

 

[Dr. McKay]

@Weaselboy : ran the command in terminal, all 0...

As for the SMC reset, I shut down AND pull the plug from the mains every day...

 

[GGJstudios]

As for the SMC reset, I shut down AND pull the plug from the mains every day...

Why?

 

[Dr. McKay]

Why?

Peace of mind ?

 

[GGJstudios]

Peace of mind ?

It's perfectly safe to leave your Mac on for many months at a time. Many users only use sleep mode, restarting only when a Software Update requires it. There is no need or benefit to shutting down every night, other than saving a few pennies worth of electricity.