Imac/Lion power down instead of sleep

My new iMac powers down after sleeping. 2 Hours of sleuthing with Applecare is unable to find the problem. There have been no power outages, the energy saver has no scheduled power cycling, we've reset the parameter RAM, and many other checks and tests.
It behaved most of yesterday after I removed the wireless keyboard from the room. But, in the middle of the night,
I found it powered off again.
This morning, it was powering down (instead of sleeping) again about half the time. I let it sleep by energy saver timeout, not the power button.
Then I switched to a different user (only used for remote sharing). All day today, sleep has worked with no power downs - about 10 hrs so far.
Have any of you experienced any misbehavior like this? How did you stop the power downs? Clues?
Thanks, Tony
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I havent' connected them because I suspect that the old monitor was causing the problem. I plug in the hard drives only as I need them but don't leave them on. It's only been four days now but I haven't had the powering off issue since I unplugged everything. I may buy a new second monitor as the one I was using was from an old Mac Quicksilver Tower and needed a specialized adapter to work.I seem to remeber there is also a setting somewhere in prefernces that allows you to use the power button to put the iMac to sleep. I think i also uchecked that option in addition to unplugging everything.
Good Luck!

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After installing Mac OS 10.5.8 my 2005 iMac G5 shuts down instead of sleeping

After install of OS 10.5.8 my iMac G5 - 2005 model, no Intel processor - whenever I choose sleep from the Apple menu or the time-out goes to sleep mode the computer shuts down instead of sleeping. Any insight would be appreciated.
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Try using Disk Utility t repair your disk
   1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
   2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
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G5 iMac sometimes shuts down instead of sleeping

I’ve recently started having a problem with my G5 iMac whereby it shuts down by itself after a while instead of sleeping.
Basically, I start up a task that might take awhile, such as burning photos to a DVD for backups, or updating an Aperture vault, and I go away for a while. I come back later, and sometimes I find that my iMac is sleeping as expected, and other times I find that it has shut itself down. It appears to complete the task before it shuts down. I’ve checked all of the preferences and can’t find any that tell it to shut down.
I’ve also checked the lists of G5 iMac that are affected by the known power supply capacitor issue, but mine is not in the list of affected units
I’ve searched the forums here, and I haven’t seen any other reports of this happening to anybody else.
Any ideas on what is happening?
PS: I’ve also been having occasional issues with unmounting external WD (Western Digital) FW drives lately too. I dismount the drive from the desktop, and the icon disappears as normal. I then power the drive down, but sometimes it will warn me that the drive was improperly removed and that data could be lost. This is odd since the drive icon was no longer on the desktop, so the drive appeared to be dismounted. This has happened with several different WD FW drives. The only thing I’ve noticed is that this doesn’t happen if the external drive appears to go to sleep after dismount. Sometimes, the drive appears to be active (even though the icon has disappeared). Again, any ideas?
Thanks in advance for your help.

MGW wrote:
Do your fans get very noisy before a shutdown?
Not before a normal shutdown. And since I'm never around when it shuts down by itself, I can't say for now.
MGW wrote:
It seems that you have some sort of thermal overload that causes the machine >to shut down during intensive use. You have enough RAM, and I assume that >your drive has at least 10-15% of free space, so either the thermal paste has >dried out, there is a bad connection or as a last thought, your logic board >could be failing.
I think I have around 165 GB or so of free space on the internal drive, so that should be OK. I didn't know about the thermal paste.
MGW wrote:
If it keeps on happening, you should, after making a full backup, take it in >to Apple and have them take a look.
I'm trying to keep my backups up to date, and I figured that it may need to go in. At some point, I would like to get a new computer, either a new 24" iMac, or a Mac Pro with a 30" monitor. I was hoping to get the new one before I'd need to send this one in for repair, but I might not be able to wait. This iMac is about 3.5 years old, so my Apple Care has expired.
It is odd that it always seems to complete the task at hand before the shutdown. If it was purely due to hardware, it should be more random than that, and not wait for the task to complete. I was starting to wonder if there is some sort of bug in the latest version of Leopard. I didn't have this happen before I upgraded to 10.5.6, but maybe that just a coincidence.
Thanks again for you help.

IMac G5 shuts down instead of sleeping

Just recently (after install of 10.4.9 and latest security update), computer shuts down when I try to "sleep" it. This occurs from the "Apple Menu", the "Welcome Screen" and the power button (when assigned this function from the preferences). This problem originally started as rebooting when trying to "sleep" it.
It also has the annoying condition that when powering it up after an "uncommanded" shutdown (or any shutdown for that matter), it has dropped the connection to my router as if the ethernet card(?) is no longer operational. However, restarting from my account usually reconnects to the router.
I have tried the following;
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None of this has helped.
Other than this the computer seems to be operating normally.
But I would like to be able to put it to sleep rather than let it run all the time or go thru the process of restaring after powering up to regain my internet connection.
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Thanks for the response. I checked my serial number and it does fall within the range for the repair extension. However, it is not exhibiting the symptoms ( no video, no power and scrambled or distorted video) for which the repair is authorized.
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IMac G5 shuts down instead of going to sleep

Recently, my G5 iMac started shutting down instead of going to sleep. I have reset all of the sleep controls but it still shuts down. Does anyone have any ideas? I am running 10.5.5

Have you vacuumed the fans and the air vents? You can also reset the [SMU|http://docs.info.apple.com/article.html?artnum=300908] and check in Console>system log for any messages about "maximum temperature exceeded for 30 seconds".

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You might try resetting the SMC and see if this helps:
http://support.apple.com/kb/HT1411?viewlocale=en_US
Good luck!

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Why is my computer shutting down instead of sleeping?

My comptuer is shutting down instead of sleeping. I have looked at my preferences a million times and nothing has changed regarding my sleep time or any other options.
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Check System Preferences > Energy Saver > Schedule

Shuts down instead of sleep

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Not sure what to look for with USB software, I haven't really installed
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IMac shuts down instead of sleeping

Hi everybody. Forum newbie here. I'm having a bit of trouble with my iMac. First of all, it's a G5 with 2.0 GB of facory installed RAM, and running OSX 10.4. I bought it barely used from a friend and when I first got it in the spring it shut down instead of going to sleep a couple of times. It wasn't a big deal, since it was overnight and not in use at the time. From then on it was fine. Over the past few days however, it has started doing this again, and much more aggressively.
It seems that it doesn't go to sleep at all anymore. It just shuts down. If you put it to sleep it will shut down. If it goes to sleep on its own, it shuts down. I went into the preferences panel and set it so it never goes to sleep and the monitor shuts down after 2 hours. I left it and went back to it after about 20 minutes and it had shut down. This happened repeatedly last night, causing me to waste 6 or 7 DVD-R, as I was attempting to burn one and it would shut down during the burning process. I had a pretty bad case of computer-induced Tourrette's syndrome I've gotta say.
As long as it's in use, there's no problem, but if you leave it alone for any length of time over say 20 minutes it seems that it's going to shut down regardless of your energy saving settings. And it doesn't seem to sleep at all anymore.
I do lots of video work and between burning DVDs and rendering video, I frequently need to leave the computer alone and let it do its thing. If it's going to shut down every time I leave it alone, then that makes my work impossible, or at least extremely annoying as I will have to run back and forth every 10 minutes to jiggle the mouse to make sure it doesn't go to sleep.
Anyone know what might be causing this or how to fix it? Thanks so much!
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Welcome to Discussions. Which model do you have? If it's a Rev A (not ambient light and no iSight), then you might qualify for the Repair Extension Program. In any case, try and reset your PMU/SMU. PLease post back,
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MacBook shuts down instead of sleeping when battery low

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Now I have a new problem...it's that the MacBook doesn't seem to want to sleep when the battery gets low. Instead, it will suddenly shut down without warning. In the past, I seem to recall that it would give alerts saying that my power was low, and eventually force itself to sleep. However, now the battery can be as high as 15-20% and the MacBook will shut down. This never happens when the battery is not on the low side, so I'm wondering if this is a problem with the MacBook guaging how much power it has left. Sometimes, I notice that when I plug it in and reboot, the battery says it is at 0%, even though it clearly was not prior to the shutdown (though that didn't happen just now when it shut down - when I rebooted after connecting the AC adapter, it was at 15%).
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The same thing happened to me last night -- the Macbook shut down because of low battery instead of sleeping, and it gave no warning messages at all as the battery power got low.
I never had the sudden shutdown problems, though.
I also checked the battery capacity with CoconutBattery, and it reported that the Max Battery Capacity was 4105 mAh, which is only 78% of the battery's original max capacity. Today, CoconutBattery reports that the battery's max capacity is 5035 mAh (96% of original capacity), which is more reasonable for a laptop less than a year old.
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When I click on sleep on my Imac, it shuts down not just sleep.

When I click on my Imac to sleep, it shuts down instead of just sleep

Hi hankfromcharles,
If you are having unusual sleep issues with your iMac, you may find the troubleshooting steps outlined in the following article helpful:
OS X: When your Mac doesn't sleep or wake
http://support.apple.com/kb/TS5357
Regards,
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Shutting down instead of sleeping..

For some reason, my Mac keeps shutting down instead of going to sleep. I've checked all the settings and nothing I can find is set to shut down. Any idea what is going on? Possibly related... my Dashboard stuff keeps disappearing (see post in Finder,Dock discussions) Hope someone can help!

Any time you have problems with power management or sleep/wake or shutdown/boot there are a few basic steps to try. These apply both to Tiger (10.4.x) and Leopard (10.5.x) versions of the Mac OS.
First, reset the low level controller in your computer that handles power management and sleep/wake functions (including scheduled events). In an intel-based Mac that is the SMC. In a powePC-based Mac that is the PMU. To do this, go to the main Support page here and search for "reset SMC" or "reset PMU" as is appropriate in the search field at the top LEFT of that page. In the list of Knowledge Base articles returned, find the instructions specific to your model of Mac. It is not tough to do, but you do have to find the instructions for your specific Mac. Note that resetting a PMU may require you to manually adjust the date and time (System Preferences / Date & Time) the next time you log in.
Next, reset the Parameter memory (PRAM). PRAM holds copies of various system settings for rapid access and if it gets out of whack all sorts of odd things can happen. The instructions for resetting PRAM are the same for all Macs. Shut Down the computer. Locate the 4 keys Apple-Option-P-R. Press and hold those 4 keys, and while doing so, press and release the power button. Keep those 4 keys held down until you hear the SECOND startup chime, then release them. Your computer will continue to boot up normally.
Finally, perform a Safe Mode boot. A Safe Mode boot does some maintenance tasks in the background such as repairing critical system file permissions and deleting some cache files, etc. To do a Safe Mode boot, hold the "shift" key while booting until you see the spinning gear on the gray Apple screen. Be patient, this will take a while. Eventually you will get to a log in window that includes a notation that you are booted in Safe Mode. No need to log in as the maintenance stuff has already happened. So just Shut Down from there and reboot normally.
If your Sleep problem persists after these three steps, take a look in the Console to see if any helpful error messages are being thrown (Applications / Utilities / Console -- select "All Messages" in the column on the left). Now even during a NORMAL boot and log in, there are a lot of Console messages generated, some of which can look pretty scary if you are not used to them. But a normal Sleep or Shut Down should generate very few messages, so scroll back in the list to the time where you tried to put the computer to Sleep and see what you find.
--Bob

Imac/Lion power down instead of sleep

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