G4 MDD won't sleep

Hi everyone,
This problem began when I was running Panther, and today I upgraded to Tiger, but the problem persists.
My computer won't go into sleep mode. When I try to put it to sleep, the display shuts off, but the computer is still running. At that point, I try clicking the mouse and/or keyboard, pressing the power button, trying various combinations of control/escape/apple keys to execute a hard quit, but nothing I do gets the display to come back up or the computer to power off or restart. So I'm forced to cut the power to the CPU and then power it back on. I know this is terrible for the computer, and I hate to do it, but I don't really have any other option.
When the problem first appeared, I could at least get the computer to shut down, but now it won't even do that. It gets to the spinning wheel screen and just hangs there, and again, I have to resort to cutting the power.
It's crazy to have to go through all this, and I certainly don't want to damage my computer. Does anyone have any experience with this sort of problem, and/or any ideas for a fix?
Many thanks!
Kate
MDD Powermac G4 Mac OS X (10.4)
MDD Powermac G4 Mac OS X (10.3.7)

First,
Try using Disk Utility to repair your startup disk (hard drive) as shown in Dr.Smokes Resolving Disk, Permission, and Cache Corruption. All those hard shutdowns can cause directory corruption.
If that didn't fix it, read on:
This is for a Mac that won't sleep.
First, read things in Apple doc.#25801 on sleep settings.
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.
If you've set your Mac to recieve faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Recieve Faxes On This Computer box.
If that does'nt work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB cards.
tomhorvat adds this; After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.

Similar Messages

Dual 867 MDD won't sleep after memory upgrade

Since yesterday my PowerMac G4 Dual 867 MDD has become insomniac. What changed since yesterday is that I installed an additional 512MB of RAM. So far as memory is concerned, there's the factory-installed 512 Infineon module; a second 512MB Kingston module (installed about a couple of years ago, and has been working fine ever since); and a third 512MB Kingston module (the one I installed yesterday) for a total of 1.5GB.
I am aware that sleeping issues can arise for all sorts of reasons (inc. USB peripherals) but it is pretty obvious that in my case the problem is caused by the memory upgrade.
The symptoms: Once I click Sleep on the Apple menu, I can hear the sound of the hard disks spinning down, but the rest of the box remains fully powered. The screen freezes and the computer has to be manually switched off, as the mouse cursor disappears from the screen and the keyboard becomes completely unresponsive.
So far I have tried the following: I have reset the PRAM (no luck there), and have tried switching memory modules to different sockets (basically, the single remaining free slot). I apologise in advance if that second troubleshooting routine might portray me as an ignoramus; I have a good understanding of things but cannot claim to be an expert.
I am a extremely frequent user of the sleep mode, and this issue has taken away from me all the pleasure that comes with a coveted (and long overdue) memory upgrade. I would deeply appreciate any help in resolving this.
Many thanks

Dear Dave,
Many thanks for your prompt response. I ran Rember (Amount of memory to test: "All". All other boxes unchecked - I was running other apps at the time). I cannot understand the results from the log, but I didn't get any feedback at the end of the testing. I attach the contents of the log below:
Memtest version 4.13 (32-bit)
Copyright (C) 2004 Charles Cazabon
Copyright (C) 2004, 2005 Tony Scaminaci (Macintosh port)
Licensed under the GNU General Public License version 2 only
MacOS X (Darwin) running in multiuser mode
POSIX version 200112
Pagesize is 4096
Requested memory: 18MB (19693568 bytes)
Available memory: 18MB (19693568 bytes)
Allocated memory: 18MB (19693568 bytes) at local address 0x02008000
Attempting memory lock... locked successfully
Creating test buffers...
Buffer A: 9MB (9846784 bytes) at local address 0x02008000
Buffer B: 9MB (9846784 bytes) at local address 0x0296c000
Running 1 test sequence...
Test sequence 1 of 1:
Stuck Address : ok
Random Value : \ ok
Compare XOR : ok
Compare SUB : ok
Compare MUL : ok
Compare DIV : ok
Compare OR : ok
Compare AND : ok
Sequential Increment: ok
Solid Bits : setting 1 of 64ok
Block Sequential : setting 1 of 256testing 224 of 256setting 225 of 256testing 225 of 256setting 226 of 256testing 226 of 256setting 227 of 256testing 227 of 256setting 228 of 256testing 228 of 256setting 229 of 256testing 229 of 256setting 230 of 256testing 230 of 256setting 231 of 256g 238 of 256setting 239 of 256testing 239 of 256setting 240 of 256testing 240 of 256setting 241 of 256testing 241 of 256setting 242 of 256testing 242 of 256setting 243 of 256testing 243 of 256setting 244 of 256testing 244 of 256setting 245 of 256testing 245 of 256setting 246 of 256testing 246 of 256setting 247 of 256testing 247 of 256setting 248 of 256testing 248 of 256setting 249 of 256testing 249 of 256setting 250 of 256ok
Checkerboard : setting 1 of 64ok
Bit Spread : ok
Bit Flip : setting 1 of 256ok
Walking Ones : setting 1 of 64ok
Walking Zeroes : setting 1 of 64All tests passed.
Thanks again,
Alex

Power Mac G4 MDD won't wake from sleep mode

I have a Power Mac G4 MDD 1.25GHz with a 15" Apple display and running 10.4.
I can not wake the computer up from the sleep mode. It will not respond to the mouse moving, a mouse click, a keyboard key, the power button on the display or the power button on the computer.
The only thing I can do is force the computer off by holding in the power button (on display or computer) and restarting the computer.
The computer is set to go to sleep after 1 hour of no use (or the issue happens if I put it to sleep).
Any thoughts would be great.

This is for a Mac that won't sleep.
Here is KB article HT1776 with their tips.
Mine follow;
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.If you've set your Mac to receive faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Receive Faxes On This Computer box.
If that doesn't work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB cards.
Also, here is Apple doc.#305262 about PCI cards and sleep.
tomhorvat adds this; After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.
Tristan Currier noticed this; "I have a Canon printer(shared) and my imac would not sleep. I opened up printer/fax in system prefs and noticed it said the printer was in use when it was off. Opened up the printer queue and noticed about 7 pending documents. Deleted them all and now it sleeps.
Check the printer queue!"
Good Luck!  DALE

G4 MDD won't go to sleep

Got new monitors, nice! Now,the Mac won't sleep. No, I don't think it's the new monitors, in fact, I was amazed how quickly the mac went to sleep at first. I did, however, have to press the on button on the CPU to wake it up, a key stoke didn't do the job. What could be stopping my Mac from going to sleep? At times, I can't get it to shut down either, without pressing the CPU button and holding it for along time.
Please help poor old Mac.
Patt

Hi Patt-
Many factors can cause sleep disorders.
Common causes are USB PCI cards, active external hard drives, active internal processes, corruption of the hard drive directory, corruption of the PMU.
Disconnection or powering off PCI connected USB devices usually clears that problem.
If the new monitors have USB connections, try without them connected.
Allowing drives to spin down or ejecting them prior to sleep will keep the drives from interfering.
Spotlight is a process that can interfere with sleep (among others). Checking active processes with Activity Monitor can help ID the culprit.
Active internet connections or network settings can also interfere.
Boot to the OS install disc and using Disk Utility to "Repair Disk" on the boot drive is always beneficial, even if it doesn't clear the problem.
DiskWarrior is better.
A reset of the PMU can clear corrupt power management settings which interfere with sleep.
http://support.apple.com/kb/HT1939?viewlocale=en_US
More:
http://docs.info.apple.com/article.html?artnum=303698
For totally stubborn machines where all above "fixes" fail:
http://www.dragonone.com/products/macosx/pleasesleep/

MDD went to sleep and wont wake up!

twin g4 867 MDD went to sleep at its scheduled time (2AM) The next day it would not wake from sleep as far as i could tell. Unplugged it, plugged it back in and i get startup tones but no video feed. HD's and fans are spinning. anyone have any ideas? Monitor burnout? graphics card? (i have a a nvidia gforce ti) im running tiger with all the updates, and an apple 20in cinema display. THANKS!!!

Are you able to bootup on your install disk?
Try using Disk Utility to repair your startup disk (hard drive) as shown in Dr.Smokes Resolving Disk, Permission, and Cache Corruption.
If it's a no wake from sleep issue, read on;
If your Mac happily goes to sleep but won't wake up--Hold down the power switch to force-reboot your machine and get it running again.
Don't worry-your Mac isn't narcoleptic. Its Open Firmware system or NVRAM (nonvolatile RAM) is likely corrupt, and your Mac can't remember how to wake up.
Restart your Mac and immediately hold down the Command-Option-O-F key combo until you see a somewhat intimidating command-line display that ends with the Open Fimware prompt. Type the following lines:
reset-nvram
press Return on keyboard
set-defaults
press Return
reset-all
press Return
Your Mac will reboot. Once it's running, put it back to sleep to test. If the problem recurs your Energy Saver preferences may be the culprit. Delete the com.apple.PowerManagement.plist file (go to Finder/Hard drive/Library/Preferences/SystemConfiguration)--don't worry, your Mac will regenerate a new one--and then restart to see if that rights the wrong.
Still did'nt work? Might be time to call AppleCare or see an Apple Genius or a technician.
Cheers!
DALE

Macbook Pro won't sleep after updating to 10.4.11

Hi,
I just updated to 10.4.11 reluctantly from 10.4.9 as whenever I do update I always have issues...I basically just went to software update last week and updated to everything I could. I've just been reading the forums and noted that updating is not always that easy...
Well basically my computer won't sleep if the lid is left open, this is IMMENSELY annoying since I often leave my desk to work on drawings, and I don't want energy being wasted like it is at the minute. Call me picky but I just want my computer to work.
I've reseted the PRAM, (option, alt, p and r), closed all applications, etc, but no luck...
Its a 2.2ghz MacBook pro, 2GB. Thank you in advance
Neal

The important thing for the future imho, is to always Repair Permissions before & after any update... seems to ward off most of these problems. Of course that is only good if the disk is Verified once in awhile.
Using Disk Utility in Mac OS X 10.4.3 or later to verify or repair disks...
http://docs.info.apple.com/article.html?artnum=302672
About Disk Utility's Repair Disk Permissions feature...
http://docs.info.apple.com/article.html?artnum=25751
In fact I'd start with those 2 now, if that doesn't help you may need to reapply some updates by getting them directly from apple>downloads.

Machine won't sleep on it's own.

This may not be a Leopard specific issue, I had it with Tiger also. My eMac and new iMac won't sleep with the HP All-in-One printer software installed. The software has three active apps (one which controls a root process) that won't let it sleep. I can manually sleep it, but the energy saver setting is useless. The display will sleep, but not the machine.
I posted in the eMac category, but this is not machine specific, either, seems to be HP specific.
I trashed the culprit apps, but then I couldn't scan (the device was not found); it did let the machine sleep, though. I tried fixing the permissions after re-installing the latest software from the HP site (a VERY long process), and turning off the printer, still no sleep.
Anyone else have this issue? Any suggestions? I thought maybe if I created an alias for the culprit apps and stored the originals on a removable device, or even a .dmg and only mount it when I need certain printer functions, that may stop them from constantly running.
Any help would be appreciated
Bob
Message was edited by: Robert Treadway

Thanks gws,
My eMac FINALLY achieved sleep last night after about 50 min. I have the sleep timer set for 1 minute, maybe the fact there was a scheduled TM backup kept it awake. I have the printer turned off, and it has been manually slept and re-started since it was turned off, don't know if any of those was a factor.
A few logs from last night/this morning:
Feb 29 23:23:15 Robert-Treadways-Computer kernel[0]: System Wake
Feb 29 23:23:15 Robert-Treadways-Computer kernel[0]: Wake event 0020
Feb 29 23:23:15 Robert-Treadways-Computer kernel[0]: Sound assertion "0 != err" failed in "AppleLegacyAudio/AppleTexas2Audio/AppleTexas2Audio.cpp" at line 960 goto Exit
Feb 29 23:23:15 Robert-Treadways-Computer kernel[0]: ^P
Feb 29 23:23:15 Robert-Treadways-Computer kernel[0]: USB caused wake event (OHCI)
Feb 29 23:23:16 Robert-Treadways-Computer kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex (PHY regs 5,6:0x4de1,0x0007)
Feb 29 23:34:25 Robert-Treadways-Computer fseventsd[38]: callback_client: ERROR: d2fcallbackrpc() => (ipc/send) invalid destination port (268435459) for pid 219
Feb 29 23:36:02 Robert-Treadways-Computer Mail[226]: Trying to add a To Do UID (3FA8ABA1-EC04-4B4B-A3D8-B9E27DE7C614) that already exists in the cache and for the same mailbox. Perhaps this should have been an update. Skipping to avoid cyclic reconciliation.
Feb 29 23:36:09 Robert-Treadways-Computer /usr/sbin/ocspd[229]: starting
Feb 29 23:39:04 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Starting standard backup
Feb 29 23:39:04 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Backing up to: /Volumes/Time Machine/Backups.backupdb
Feb 29 23:39:24 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: No pre-backup thinning needed: 100.0 MB requested (including padding), 167.86 GB available
Feb 29 23:39:54 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Copied 3569 files (10.1 MB) from volume Macintosh HD.
Feb 29 23:39:55 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: No pre-backup thinning needed: 100.0 MB requested (including padding), 167.84 GB available
Feb 29 23:39:58 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Copied 441 files (32 KB) from volume Macintosh HD.
Feb 29 23:40:00 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Starting post-backup thinning
Feb 29 23:40:14 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Deleted backup /Volumes/Time Machine/Backups.backupdb/Robert Treadways Computer/2008-01-30-201029: 167.85 GB now available
Feb 29 23:40:19 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Deleted backup /Volumes/Time Machine/Backups.backupdb/Robert Treadways Computer/2008-02-27-231957: 167.86 GB now available
Feb 29 23:40:19 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Post-back up thinning complete: 2 expired backups removed
Feb 29 23:40:19 Robert-Treadways-Computer /System/Library/CoreServices/backupd[236]: Backup completed successfully.
Mar 1 00:00:35 Robert-Treadways-Computer newsyslog[260]: logfile turned over
Mar 1 00:00:35 Robert-Treadways-Computer newsyslog[260]: logfile turned over
Mar 1 00:11:00 Robert-Treadways-Computer kernel[0]: System Sleep
Mar 1 05:55:37 Robert-Treadways-Computer kernel[0]: System Wake
Mar 1 05:55:37 Robert-Treadways-Computer kernel[0]: Wake event 0020
Mar 1 05:55:37 Robert-Treadways-Computer kernel[0]: Sound assertion "0 != err" failed in "AppleLegacyAudio/AppleTexas2Audio/AppleTexas2Audio.cpp" at line 960 goto Exit
Mar 1 05:55:37 Robert-Treadways-Computer kernel[0]: ^P
Mar 1 05:55:37 Robert-Treadways-Computer kernel[0]: USB caused wake event (OHCI)
Mar 1 05:55:39 Robert-Treadways-Computer kernel[0]: UniNEnet::monitorLinkStatus - Link is up at 100 Mbps - Full Duplex (PHY regs 5,6:0x4de1,0x0007)
I had anacron installed, but removed it the best I could, it is not needed in Leopard.........
Thanks for the advice, gws, maybe your system would react the same after re-start and/or sleep with printer turned off?
Bob
P.S. Be sure your Mail is not set to check for new mail every 1 minute, that will stop sleep, too
Message was edited by: Robert Treadway

My MBP won't sleep HD, and I have tried every solution already posted.

This is a persistent problem that began over 1 year ago, so information about how this unit might have been configured when it began is no longer available, but I have scoured this and google in general, using all search terms I can think of and still I can not pin point a reason my HD will not sleep. I have been advised that there is a "process" keeping my unit awake, but I don't understand how that is possible when it won't even sleep when it is on the startup screen. So here are some particulars.....maybe you have some new thoughts?
I drive a MBP with a 2.4 Core Duo processor running OS 10.9.1, 5gb of mem, 750gb of storage with 500+ free.
1) I made a clean install of system software and a clean upgrade to Mavericks (as a way to try to solve the problem which began when I was using Mtn Lion). There is no third part software loaded onto the machine, yet.
2) I have yet to launch iTunes, or iPhoto, or a Browser, no printer has been added.
3) The result is the same regardless of user or preferences. It does it in "safe mode". The Terminal doesn't give any reason for aborting sleep using "pmset -g" command. It just has a "10". Bluetooth is turned off, notifications are turned off, sharing is turned off, airport is turned off...it's not even connected to the internet. The only software on the computer is the system. There are no peripherals.
4) It won't sleep even on the start-up screen. It won't sleep if I go through the menu or close the lid. It will power off the monitor, and begin to wind down the HD, but just as it reaches the end of the sequence BING and the screen comes on again. If the lid is closed, it will stay that way until the battery runs out, unless it's plugged in. SMC and VMRAM resets not effective.
5) I have no files on this computer so I don't care about losing them.
6) This computer did not have this problem using Snow Leopard, and even worked for a time using Mtn Lion and changing to Mavericks has not affected the problem which leads me to think it's not OS related. It acts like a firmware issue, but as far as I can find there is no firmware upgrade for my unit.

Hello Bobz,
Thank you for responding. You require that I modify #2, above. I have now gone on internet, opened Safari. I downloaded etrecheck, restarted, waited for computer to cycle through sleep cycle (1 min). After failure, I ran etrecheck. Here are the results:
Hardware Information:
          MacBook Pro (15-inch Early 2008)
          MacBook Pro - model: MacBookPro4,1
          1 2.4 GHz Intel Core 2 Duo CPU: 2 cores
          5 GB RAM
Video Information:
          GeForce 8600M GT     - VRAM: 256 MB
System Software:
          OS X 10.9.1 (13B42) - Uptime: 0 days 0:29:13
Disk Information:
          ST9750420AS disk0 : (750.16 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    inni (disk0s2) /: 749.3 GB (353.92 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Apple Inc. Built-in iSight
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Computer, Inc. IR Receiver
          Apple, Inc. Apple Internal Keyboard / Trackpad
FireWire Information:
Thunderbolt Information:
Kernel Extensions:
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
Launch Agents:
User Launch Agents:
User Login Items:
          None
Internet Plug-ins:
          Default Browser: Version: 537 - SDK 10.9
          QuickTime Plugin: Version: 7.7.3
Audio Plug-ins:
          BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
          iSightAudio: Version: 7.7.3 - SDK 10.9
3rd Party Preference Panes:
          None
Bad Fonts:
          None
Old Applications:
          None
Time Machine:
          Time Machine not configured!
Top Processes by CPU:
               5%          WindowServer
               2%          EtreCheck
               0%          mds_stores
               0%          mds
               0%          imagent
Top Processes by Memory:
          61 MB          Finder
          51 MB          mds_stores
          46 MB          WindowServer
          31 MB          mds
          31 MB          Dock
Virtual Memory Information:
          3.75 GB          Free RAM
          617 MB          Active RAM
          130 MB          Inactive RAM
          530 MB          Wired RAM
          218 MB          Page-ins
          0 B          Page-outs

Macbook Pro won't sleep

I have this setup: a MacBook Pro running Mountain Lion, an external 27" cinema display, a bluetooth apple keyboard and a bluetooth magic mouse.
The MacBook Pro runs with the lid closed.
It looks like the computer won't sleep anymore. It stays on for days when not using it. In my settings I have set I want the computer to sleep after 15 minutes of inactivity.
I prefer to switch off the keyboard and mouse when I'm away from my computer, so I can't use the Apple menu or shortcuts to make the computer sleep.
Any idea?

i am pretty sure this is because you have it connected to an external display. i am not sure if there is a workaround for this.

External display won't sleep

I just purchased an NEC PA271 27" LCD display for my Mac Pro. It's beautiful, clear and sharp, but there's one problem: it won't sleep.
When I put the computer to sleep or shut it down, the monitor doesn't go into sleep mode. The blue LED on the front is supposed to turn amber, indicating sleep, but it doesn't.
I've tried resetting the SMC and PRAM, as well as repairing permissions, to no avail.
Any ideas?

I should also mention that I didn't have any problems with my ACD 23" previously, so it would seem to be an issue with this particular display and how it communicates with my Mac Pro.

MacBook Pro won't sleep with external monitor

Hello,
have a problem. I'm using external monitor with my MacBook Pro. If I close the lid, I see all windows on external monitor and Yosemite won't sleep. Can you help me please? My external monitor is Samsung 21.5" and I'm connecting it to MacBook Pro via DVI.
Thank you

Hey Renecek,
My first thought was, "Hey, you are using closed-clamshell mode".
How to use your Mac notebook computer in closed-clamshell (display closed) mode with an external display - Apple Support
But then I realized, wait, you want it to sleep.
For that, check out the suggestions in these articles.
OS X Yosemite: If your Mac won’t go to or stay in sleep
OS X: When your Mac doesn't sleep or wake - Apple Support
Take care,
Nubz

Won't sleep

Hello,
I have an iBook G4 running 10.4.11. Just had the HD replaced (original failed). All seems to be working fine, with one exception: the computer won't sleep according to the Energy Saver settings.
I have it set to display sleep after 3 minutes, HD sleep after 4 min. The display sleep works, but the HD sleep doesn't. I believe all was working prior to HD replacement.
The computer does sleep if I close the lid or command a sleep from the apple menu.
Any thoughts?

Yes, I did search the boards. Most people seem to experience trouble getting the computer to sleep when the close the screen, or w/ intermittent sleep. I didn't see anyone else w/ the particular problem I'm having.
I had thought I might trash the system preferences preferences (systempreferences.plist), but I'm not sure what other carnage that will unleash...

Won't sleep when I close the lid - HELP!

A while ago, my iBook G4 1GHz was knocked off of a table. The display was smashed and the whole display assembly was destroyed. I bought a new (used) display assembly and installed it. Worked fine, but when I closed the lid, the iBook woudn't sleep. I checked the placement of the magnet in the top case and I reset the PMU. Still no sleep. So I contacted the company that sold me the display and got a different one. Still won't sleep when I close the lid. I checked all of the energy settings, reset the PMU and even tried to force sleep with a magnet from another broken iBook. Still no sleep when I close the lid. It will sleep when I choose sleep from the Apple menu (OS Tiger) and when it sits for a while with the lid open, but not when I close the lid. Any thoughts?

My original problem has not been solved. The iBook still won't go to sleep when I close the lid. I have checked out any possible software causes, and have ruled them out. I have checked to make sure no keys were being pressed when I closed the lid. I took a magnet from another iBook top case and ran it down the side of the display to try to force sleep. No effect. I don't have any Firewire or USB devices attached, to that's not it. Apple, this board, PBFixit.com, and my local Apple-affiliated repair center have no idea why I am having this problem. Two display assemblies have experienced this problem. The original display had been destroyed in a drop. Could some internal damage, like maybe to the logic board, result in such a problem? It's odd that I am the only person out there who has had this problem. Weird, to be sure.

When I'm on a Skype, Mac Air display won't sleep?

I often have a Skype call connected as my boyfriend and I are having a long distance. The display would sleep when I was having a call and out of the room when I was using OS X 10.6.8
but since I've changed to use mountain Lion 10.8.2, It won't sleep.......
I think its hurting my display for keeping a long time on.
What's the problem?

I've already unchecked "Wake for Wi-Fi Network Access" but its not working...
but the problem has just happened after I upgraded my OS...
I wont end it... because we r in different time zone so he would like to keep it connected when he's sleeping....
help ><!

New iMac display won't sleep?

Hi, new iMac 24", 10.5.7, set screen saver at 5 minutes, and display to sleep at 10 minutes. Screen saver works, but it will not sleep. I've changed the setting, and rebooted, still no luck.
I tried everything from suggestions, with no help. I found that if I turn off "screen sharing" in system preferences, it will sleep the display for whatever minutes I set. I have to leave "screen sharing" on because I have flat screen tv hooked up to watch video files on, and I use iPhone app to control screen, to hit play and pause, etc. It is set up with a password, and only my iPhone is used when I am watching something. Why should screen sharing stop display from sleeping? I've left screen sharing on since I got this, so I can remotely log in with "back to my mac" from the road, and it never stopped the display from sleeping before? I shouldn't have to turn off screen sharing just to sleep the display? Am I missing something?

This is for a Mac that won't sleep.
Here is KB article HT1776 with their tips.
Mine follow;
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.
If you've set your Mac to receive faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Receive Faxes On This Computer box.If that doesn't work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Hope this helps!
P.S. One member here reported this (Michael Gleason);
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
Dave Hamilton provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB card.
Also, here is Apple KB article TA2469 about PCI cards and sleep.
tomhorvat adds this; After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.
Tristan Currier noticed this; "I have a Canon printer(shared) and my imac would not sleep. I opened up printer/fax in system prefs and noticed it said the printer was in use when it was off. Opened up the printer queue and noticed about 7 pending documents. Deleted them all and now it sleeps.
Check the printer queue!"
Allan Jones says "sometimes there is Network activity: launch System Preferences > Energy Saver > "Options" tab and uncheck "Wake for Ethernet network administrator access."
Good Luck!  DALE

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