IMac does not go to sleep on its own- HELP!

I have an iMac G4 17", it's about three years old, and I absolutely love it, except now it does not go to sleep on its own. It will go to sleep when you select Sleep from the Apple menu, but not when it has been inactive. In system preferences under the energy saver menu it is set to sleep after being inactive for five minutes (screen sleeps after three), and the screen does power down, but the computer itself never goes to sleep on its own (you can still hear the processor making noise (fans?) and the little white sleepy light doesnt come on) I can't seem to figure out what could be making it stay awake (no applications are running), I'm not sure if it has something to do with my external DSL modem (though i think i had the problem before i got the dsl), I tried turning off the "wake for ethernet network administrator access" and it didnt change anything. Any help?

This is for a Mac that won't sleep.
First, read things in Apple doc.#25801 on sleep settings.
Here is Apple doc.#303698 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 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.
Cheers!
DALE

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You can test as to whether this issue has to do with the external monitor. Disconnect the display. If the MacBook now goes to sleep normally, then the issue is with the display. If it does not then the issue is with the MacBook.
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I set my iMac to go to sleep after 15 minutes of inactivity. Everything worked as it should until I updated Lion to 10.7.3. Now it seems that iMac never goes to sleep on its own. No new hardware installed whatsoever, every settings are the same as before. I even tried by not running any programs, and it still won't go to sleep unless I force it to. It's a mid-2011 iMac with core i5.
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I don't have an explaination for a cause. But in the end, if you don't figure out the cause, try using PleaseSleep which attempts to force the system to obey the energy saver preferences.
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Macbook pro 13 inch early 2011 WILL NOT go to SLEEP on ITS OWN.

I am able to close the lid to have it sleep, and manually click the apple>Sleep button to get it to sleep, but with the Energy Saver preferences set for it to sleep at 1 minute it will not allow it to sleep. The display will turn off, but the Light doesn't start blinking dimly. Is anyone else having this similiar Problem? I've deleted preferences .plist files etc to try and remove any possible bad seetings but I think it may be related to this error here. I don't know if this problem is via a Firmware update or bad hardware.
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(LINE FROM MY LOG)
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Have you reset the SMC? If not, try that.
Intel-based Macs: Resetting the System Management Controller (SMC)
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pmset -g
Post any lines of output that appear below what you entered -- the text, please, not a screenshot. Then repeat with the following line:
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The screaming noise sounds like the HD may be dying.
Regarding your fan issue see Article:
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My iMac does not connect to internet via wireless after I log in. I have to open network preferences and run the assistant everytime to make it work. Its a new system, updated to Mountain Lion,.

My iMac does not connect to internet via wireless after I log in. I have to open network preferences and run the assistant everytime to make it work. Its a new system, updated to Mountain Lion,.

Hi, this has worked for a few...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.7…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x instructions...
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208.67.222.222
208.67.220.220
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Also, turn off IPv6:
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Or whatever Interface you use.

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My iMac will no longer go to sleep on its own!

Help!
My iMac will no longer go to sleep on its own! No matter what my settings are under 'Energy Saver', the computer will NOT go to sleep. Rather, the monitor will just turn off and the white light on the front of the computer will come on. The white light does not 'throb', so I know it isn't sleeping.
I'm not running any weird applications preventing it from sleeping, I've tried booting in safe mode, and I've tried resetting the SMC.
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AHH! Thanks for your help!
Jonathan

Hey everyone -
Thanks for your suggestions.
David.Austin - yes, my power LED does not fluctuate, so I know the computer isn't sleeping, the display is just 'off'. I do have all my disks set to go to sleep. This is a recent problem - everything used to work just fine.
joejoe - I haven't yet tried zapping the PRAM (or NVRAM), but I give that a shot and reset the SMC (SMU) again. If that doesn't work I'm going to have to do a... re-install.
I'll report back with my results. Glad to hear I'm not the only one with this problem.
Agreed - there is something wrong with one of those two updates.
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After installing Yosemite, my iMac wakes from sleep all on its own multiple times throughout the day and night. The screen does not turn on when this occurs and it goes back to sleep on its own. I figured the my energy settings may have changed after the upgrade, but nothing is different. I have no schedule set and the "wake for network access" is unchecked.

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It may or may not be a bug. Whether it is or not though, if it bothers you, consider providing feedback to Apple.
When questions such as yours arise, it helps to look at iOS. iPads and iPhones will all periodically connect themselves for the purposes of downloading emails, Messages, alerts etc. There is no way to disable that, other than to completely power down the device, which almost no one does. Apple has been inexorably changing OS X to effectively implement iOS design features such as this – for better or worse is not for us to say.
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iMac does not boot past Gray Screen. 2008 24" Intel iMac running Mountain Lion with 1TB hard drive.
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On bootup the following things happen:
Startup tone
Gray screen with Apple, and gear spins below Apple.
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Hello,
I reboot back into Safe Mode and run Disk Utilities and it discovers the same problems listed above with Permissions.
You can ignore repeated "fixes" it's not really a problem, if it says completed repairs that's all that's needed.
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PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
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Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons
Though I'm suspecting some corruption to your OS at the moment.

My imac will not go to sleep automatically. I've tried lots of stuff. What else?

I noticed in the past 1 to 2 weeks that my imac would not go to sleep automatically. Well, the screen will dim and go black but the hard drives/fans are not cutting off like they used to. The only change I believe I've made is the introduction of a networked attached storage device connected via a switch box.
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I've tried disconnecting the network attached storage.
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I've removed programs that were starting at log in, one by one.
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I've also tried turning the screen saver to the "never" position as I read on another post. Didn't help.

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Hi,
I'm having a weird problem with my macbook pro. When I close the lid, my macbook does not go to sleep. Even more weird: when I put my macbook to sleep using cmd + alt + the eject button or using the apple button => sleep, my macbook stops sleeping as soon as I close the lid
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Please read this whole message before doing anything.
I've tested these instructions only with the Safari web browser. If you use another browser, they may not work as described.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
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Insightful

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Phillip,
I had this problem recently with a 3-year old Mac Pro intel, which was eventually replaced by Apple due to myriad other problems. When the frozen mouse happened, there was nothing I could do. Very frustrating to have the screen boot and the cursor is up there stuck, on the top left corner of the screen. Frozen. I called support several times. They were amazed. At one point they had me buy a cheap USB mouse (I was using a wireless mouse from Logitech and they thought there might be some kind of conflict). The USB mouse didn't work, either. Neither did an Apple mouse when I went out to buy one.
I ended up driving 70 miles to take the Mac to an Apple Store. I think they reinstalled the (Leopard) system in some secret way, because when the mouse was frozen so was everything else and I couldn't open the disk drive to put the OSX disk in there.
Why I'm here right now is that the same thing happened today with my NEW 3-month-old REPLACEMENT MAC PRO using its brand new wireless mouse, and I was hoping to find some insight. Again, a frozen cursor after the boot. Same top-left corner of the screen. Unlike you, when I click the mouse nothing happens -- no drop down.
Luckily, when I hard-rebooted by holding the button in, the mouse cursor came back. This time. Now I am afraid to turn my computer off. Been there done that before. Anyone have suggestions?
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IMac does not go to sleep on its own- HELP!

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