Odd iMac sleep issues

I first noticed the issues a couple of weeks ago - mid-2007 iMac, running SL.
The iMac will sleep fine if I use the command in the apple menu or the power button.
But it won't sleep automatically as suggested in the Energy Saving preference pane. If I select the 'sleep' keyboard combination (option, command, eject), the iMac sleeps but instantly wakes again.
I've tried everything! These problems aren't due to peripherals - it was working fine with the same peripherals connected. Wake for LAN isn't selected, nor is the wake for BT option (and I don't have any BT devices). I've looked in Activity Monitor and Console and can't find any obvious process that might be keeing the Mac awake. I've tried restoring plists from a TM backup, deleting plists, resetting the PRAM and SMC.  One of these measures (not sure which one) worked ONCE. But when I went into the energy saving preference pane, it stopped sleeping automatically again.
My main concern is the lack of auto-sleep. I've scoured the forums and no one seems to have this problem together with the mac waking instantly after the sleep keyboard combo. I'm hoping this peculiar combination of probems might shed some light on what's causing them.
Any help would be greatly appreciated.

Can be very hard to impossible to track down auto sleep issues. Just get PleaseSleep.
http://www.dragonone.com/products/macosx/pleasesleep/

Similar Messages

  • IMac Sleep issues  -- anyone else ??

    I noticed there was some kind of recall for sleep/wake-up issues with the MacBook (pro?) but not the iMac. I've been having the following go on since I got my iMac about a month ago:
    Intermittently wakes up from sleep -- sometimes when I'm in the same room reading, sometimes if I put it to sleep at night it is on when I get up in the morning.
    Often, but not always, it wakes up when I pick up the phone to make a call. The system is connected (through an Apple USB modem) to a two-input phone jack, shared with my phone.
    Sometimes when I put it to sleep the screen just dims and the system locks up, necessitating a hard power-off.
    Sometimes when the system is asleep, I am unable to wake it, necessitating a hard power-off.
    I plan on bringing it in to the Apple Store one of these days, but I'm curious if anyone else is having similar problems...

    HI there,
    Try this first before taking in, reset the SMC on your machine:
    http://docs.info.apple.com/article.html?artnum=303446
    Plus, check to see if you have the latest SMC FirmWare update:
    http://docs.info.apple.com/article.html?artnum=303725
    Read but proceed with caution! Have a nice day...
    Rick
    iMac G5 iSight 20" - 30G iPOD in Slimming Black - Mac OS X (10.4.7) - HP Pav 15" WS and Toshiba Sat 17" WS LP's - Canon 20D & A620

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  • 24" iMac intel--Sleep issues--simple as widgets

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    Message was edited by: dr461

  • Sleep Issues with g5 Imac

    I have a g5 iMac running OsX Panther. 1.6 Ghz with 256 Ram.
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    First read Apple doc.#25801 on sleep settings.
    A number of sleep-related issues can appear after incremental Mac OSX updates, including the inability to properly go to sleep, problems waking from sleep, and having your display go to sleep without your Mac going to sleep. The most common culprit is Bluetooth. Try these tips to fix your sleep problems.
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    ENERGY SAVER
    If you have issues with a Mac or display that goes to sleep at inappropriate times, you may have a problem with Energy Saver. Delete the following .plist files and restart:
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    DALE

  • Sleep issues with iMac

    I have an iMac, first gen, that when I put into sleep mode, it will wake up right away. All software is up to date, running 10.6.8.

    Test after each of the following steps:
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    Step 2
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    Step 3
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  • Waking from sleep issues

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  • The old sleep issue

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    For those whom it may help.
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