IMac G5 won't sleep when I manually tell it.

Hi.
Sometimes when I click sleep from the menu, nothing happens or it goes to sleep but wakes up straight away. If in the second scenario I ask it to sleep again it sleeps normally. I always have multiple accounts open (2 users) but have only had this problem since upgrading to 10.5.
In sys prefs I have my computer set to never sleep but this shouldn't affect it. iChat is always open, could this be the cause? I find it hard to repeat the problem to test this theory.
Thanks for your help.
Rodi

I'm getting the same problem which appears to have just started right after.... of course the latest updates.
I get the old standby PRAM & SMU reset responses but those don't work & rarely do. My bluetooth problem still doesn't work & resetting the PRAM & SMU was the standby responses as well.

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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.
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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

Won't sleep when scheduled to.

My Imac is working fine. Except that it won't go to sleep when scheduled to anymore. Any suggestions on how to fix this problem?

I haven't plugged in anything new into it or installed any new software. So i don't know what it could be. I tryed zapping the PRAM. Didn't work. I tryed resetting the PMU, but iam not sure if that worked, because my clock wasn't reset. So i don't know what wrong.
You say that you haven't installed any new software, but I see you are running OSX 10.4.4 Did you recently upgrade your OS to this? If so, then it is possible that either an external device or other software also needs to be updated to reflect the change.
I tryed resetting the PMU, but iam not sure if that worked, because my clock wasn't reset. So
There is no PMU reset available for the iMac G5 - instead they have an "SMU". Resetting this doesn't affect the clock.
Cheers
Rod

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I am stumped too. The issue is that the 'pmset -g' command does not allow changing the ExternalMedia flag.
An observation that may be relevant to this topic is as follows: if you unmount the drive (but not physically disconnect it), sleep comes in the specified time. Upon wakeup, however, the drive is mounted again to the desktop. I've noticed this behavior with SD cards, and I assume that HDs should do the same.
If this is the case, then it may be possible to use ControlPlane (current version is ControlPlane-1.1.4) and create an "about to sleep" situation, which triggers USB disk unmounting. Haven't tried it, but was thinking to (subsequently just gave up and eject my USB storage manually).
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Xen

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I saw that this question was asked before but no answer was given. I got my iMac OS X Yosemite 10.10 brand new yesterday. I set up hot corners so that the display will go to sleep when I swipe it. However, no matter how carefully I swipe, it always comes right back on. I cannot get the display to sleep.
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Won't sleep when closed

Just noticed the other day that my macbook won't go to sleep when I close the screen. No applications are running. Haven't changed any software recently. Any ideas?

Try resetting your SMC and your PRAM.
Resetting the System Management Controller >>
-Bmer
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MBP Won't sleep when the screen/lid closes...

I have had my MBP for almost a year now and my AppleCare is about to expire...
Recently when I close the screen the computer will continue to run and operate as if it was never closed and will not sleep. I took it to the Apple store and they did an SMC reset which sorta helped for about 5 hours. Now it goes to sleep but will take almost a minute at times or won't sleep at all. I was told I would have to send my computer out for a couple weeks but I can't do without a computer. Please help me fix this or help me convince Apple to give me a new computer.

Run /Utilities/Console and click 'All Messages' top left then close the lid and try and put it to sleep.
If no dice open the lid and look at the Console messages - in particular look for lines including "sleepimage" and see what it says ?
I suspect there's not enough space left on your hard drive, or it badly fragmented, and the RAM sleep image can't be created or stored properly ...

MB: Won't sleep when lid closed and power connected.

Upgraded to Lion a few days ago and everything seems to be working great besides one thing:
When I close the lid on my Macbook (mid 2009) and the power is connected, the light remains on and the computer won't sleep. When i lift the lid everything is how I left it with no blink of the screen as it fires back up. However, when the power is disconnected, the computer sleeps fine when the lid is closed.
How can this be solved?
Thanks!!

OK, think I found my problem.
I had to send my laptop in for repair due to a faulty screen. When I got it back it all looked OK so the first thing I did was install Lion. Then I noticed the sleep issue so assumed it was Lion causing it. I tried the pram, SMC other settings but nothing helped. In the end I reinstalled Snow Leopard, same problem! I tried from bootcamp and same problem, wouldn't sleep when closing the lid.
Doing some googling I found a post where someone has the magnet in the display fail, which is what contacts a switch in the laptop when you close the screen. To test they suggest placing a paper clip on your screen bezel until it sticks to find the magnet, then finding where it locates when closing the screen on the laptop. Then run a small magnet (i used a small fridge one) over this location on the laptop with the screen up. I did this and instantly went to sleep!!! WOOHOO! remove magnet it wakes up, repeat and OK. Close screen without magnet and nothing.
So its gone back in for repair to have the screen replaced again.

IMac G5 won't sleep when I manually tell it.

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