iMac with Lion not waking after overnight sleep

I upgraded my machine to Mountain Lion the day it was released and have been running well since. If you recall, my work around was to disable sleeping hard disks. Now that ML is installed, I can sleep my hard disks again. All appears fine. I have not installed the cron job Kristian_F recommended to restart the BT daemon on a regular basis. I am waiting to see if I encounter the problem again. If I do, I'll give it a try.

Same here - haven't installed the restart BT daemon "fix" or sleep level.

All working fine still...

I'm having the same problem. Has anyone come back to with a fix?

I put the system to sleep manually by selecting Apple > Sleep. If I close my laptop cover it will not wake up again.

https://discussions.apple.com/thread/4091208

Have you tried upgrading to Mavericks? I updated a MacMini and the system appears stable. However, I have not yet tried on my laptop. I may do so today.

Hi, I have the same problem with Mavericks installed on an iMac 2.7GHz i5. I will try to use recovery disk …

My desktop refurb iMAC (bought 12/2011) has been shutting down rather than "going to sleep" lately. It is unresponsive to mouse or keyboard when I try and wake it, and when I push the power button on the back, it will not wake either. It does not respond until I hear the "gong" of restart. The machine is fine when I am working on it and never shuts down, or has any other issues. If I put it to sleep and try and wake it up a few minutes later, it wakes fine. It is when it is left for a few hours or overnight that it shuts down rather than sleeping.

Here are the iMac specs:

iMac 21.5 inch - Mid 2011 Memory 4 GB 1333 MHz DDR3 Graphics AMD Radeon HD 6750M 512 MB Software Mac OS X Lion 10.7.5 (11G63)

Here is what I've tried:

- Checked for and installed basic suggested Apple software updates

- Disconnected all external hard drives and external speakers, shut down all Applications (including the font application Suitcase)

- Reset the SMC by shutting down, disconnecting power plug, waited 15 seconds, plugged back in and powered computer on

- Reset PRAM

A local Apple authorized tech seems to think it is a heat problem or "power supply" that needs replacing? He is basing this strictly off my description above and has not checked the MAC yet. I've read through this entire thread and did not see that possibility mentioned. Thoughts?

Did you try installing Mavericks OS? Perhaps that may solve the sleeping issues.

Update: I just noticed the post by glanz. It's something that you could try as well however.

What is mavericks OS? Is that the newest MAC OS like lion, mountain lion etc.

The turn with Recovery Disk didn't change a thing. I then installed a new User, no difference either, so my conclusion was, it had to do with the System. I opened the ~/Library there and dit some cleaning which finally worked for my system:

I went through all entries in ~/Library (the Library folder on top level) and cleaned some very old content form all the folders found there (some were 3-5 years old!). They must have gotten copied from older machines when migrating. I didn't touch the folders in ~/System/Library!

I opened each folder in list view, clicked the top to organize by date and then removed all files that seemed too old for this installation. You have to be careful, not to delete files belonging to old apps still in use.

In this way I could remove the misbehaviour without knowing which file was actually responsible. If I had deleted an old dated file of an app still in use, I could just have reinstalled it, but this was not the case. And removing one by one was just too much of research work.

I hope, someone can use these instructions for his or her own machine. Good luck.

Here is a list of the folders found in my setting:

Address Book Plug-Ins

Application Enhancers

Application Support

Audio

Automator

Bundles

Caches

CFMSupport

ColorPickers

ColorSync

Components

Contextual Menu Items

CoreMediaIO

Desktop Pictures

Dictionaries

DirectoryServices

Documentation

DropboxHelperTools

Extensions

Filesystems

Fonts

Fonts Disabled

Frameworks

Google

Graphics

Image Capture

Input Methods

Internet Plug-Ins

iTunes

Java

Keyboard Layouts

Keychains

Compositions

LaunchAgents

LaunchDaemons

Logs

Messages

Modem Scripts

Mozilla

PDF Services

Perl

PreferencePanes

Preferences

Printers

PrivilegedHelperTools

Python

QuickLook

QuickTime

Receipts

Ruby

Sandbox

Screen Savers

ScriptingAdditions

Scripts

Security

Services

Speech

Spelling

Spotlight

StartupItems

SystemProfiler

Updates

User Pictures

Video

WebServer

Widgets

alanfromcamas wrote:

Since upgrading to Lion a few days ago, my iMac (2010) won't wake up with magic keypad swipe, button press, spacebar or any other key. Works fine and wakes fine when used periodically during the day, but is locked tight upon first use in the AM. The only thing that works is a hard power off and reboot. Any thoughts? Thanks!

I'm experiencing the same problem you describe, see my thread/post for something that will probably help:

iMac (Late 2012) - Bluetooth switches itself off after overnight sleep

I found that the bluetooth on the Mac itself was switching itself off completely. Using TeamViewer allowed me to log in and verify this.