6 Replies Latest reply: May 6, 2013 9:47 AM by Paul_31
svacdon Level 1 (0 points)

Recently, and in rapid succession, I did the following:


-had a bad hard drive replaced

-restored from time machine backup

-upgraded from snow leopard to moutain lion


After all these changes were made (and it may have even started in between some of them, but they happened so close together that if it did, I didn't notice), I am intermittently having difficulty waking the computer from sleep.  This is usually when it has been unused (and asleep) for some time.  I wiggle the mouse & give a click (which is what I usually do to wake... actually, before all the changes, it would wake with just movement of the mouse, now it seems I must either click the mouse or press a key on the keyboard, no matter what)... nothing happens.  Press a key on the keyboard... nothing happens.  Give a quick press to the power button... It makes a noise like it is waking, but the screen stays black.  (The waking sound has changed since getting the new hard drive, too - a kind of troubling whir, almost grinding.  It makes that noise, too, but doesn't wake.)  I go through all this several times... nothing happens except the sounds.  I walk away, come back maybe 10 or 15 minutes later & it usually will wake right away at the first mouse click.


This problem has been going on for a couple of weeks.  The computer has been powered down & unplugged several times in between.


I have read a lot of posts just now about similar problems... and lots of different solutions.  I am a novice & not really sure where to start.  Here is the readout I get in Terminal when I type "pmset -g":


AC Power-1*

Currently in use:

hibernatemode    0
halfdim          1
womp             1
networkoversleep 0
sleep            60 (sleep prevented by 1389)
powerbutton      1
ttyskeepawake    1
hibernatefile    /var/vm/sleepimage
autorestart      0
disksleep        10
displaysleep     15


I would be grateful for any guidance!  Thank you!

iMac, OS X Mountain Lion (10.8.3), 2.66 GHz Intel Core i5, 27-inch, La
  • svacdon Level 1 (0 points)

    Also, I meant to add that I am wondering whether the time machine backup could be involved in the problem somehow?  Things seems to slow way down when that is running.  Maybe unrelated though...

  • Paul_31 Level 6 (13,635 points)

    Some users (me included) have experienced the failure to wake from sleep problem exactly as you describe since some point in Snow Leopard 10.6.x, through Lion 10.7 and into MLion 10.8. For me the problem went away in 10.8.2 but I have seen the occasional thread on here describing the same problem. It seems to be connected with Bluetooth failing to fully wake up.

    The 'fix' that worked for me - actually a workaround rather than a fix - was: System Preferences>Energy Saver and set 'computer sleep' to 'never'.

    There one huge thread on here discussing the problem and there have been quite a few others as well.

  • svacdon Level 1 (0 points)

    Thanks, Paul... Does that mean it will just stay on the screen saver all the time... or simply that it will prevent hibernation?

  • Paul_31 Level 6 (13,635 points)

    The display will sleep but the Mac won't hibernate. The Mac should spring to life immediately on touching keyboard/mouse, etc. I know there are some on here that have it set this way as a preference, with no ill-effects on their Macs.

  • svacdon Level 1 (0 points)

    Thank you - I will give it a try!

  • Paul_31 Level 6 (13,635 points)

    You're welcome and thanks for the feedback.