My mac mini (2009) won't enter sleep mode

My mac mini won't enter sleep mode using the power button (previously did).
Preferences for this command have been checked - with no effect.

Try resetting the SMC
http://support.apple.com/kb/HT3964?viewlocale=en_US

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    This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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  • Mac mini keeps entering sleep mode

    Hi. I have a Mac mini that has this annoying problem where it keeps
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    What I notice is that my mini would enter sleep mode whenever I try to
    encode mp3. This seems reproducible. When it enters sleep mode,
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    in sleep mode after a couple seconds after it wakes up. The only way
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    Hi Carl. I was unable to find com.apple.AutoWake.plist in my
    system. Deleting com.apple.PowerManagement.plist didn't
    help.
    I decided to try your open firmware instructions. I like the
    boot loader. It reminds me of the Sun's boot monitor.
    I did the reset-nvram, set-defaults, reset-all. It didn't
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    I don't think it is my power supply, either. The reason why I
    don't think this is the problem is I can watch DVD and listen
    to audio CD just fine. My sleep problem would only occur
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    issue or a hardware problem. Since this has a Unix core
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    on system.log. Looking at the file, I found something
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    Aug 17 01:06:19 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    Doing a 'grep overtemp system.log', I got the following:
    Aug 17 01:04:13 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    Aug 17 01:04:37 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    Aug 17 01:04:56 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    Aug 17 01:05:37 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    Aug 17 01:05:51 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    Aug 17 01:06:00 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    Aug 17 01:06:13 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    Aug 17 01:06:19 Jim-Fridlunds-Computer kernel[0]: Power Management received emergency overtemp signal. Going to sleep.
    If you look at the time stamp, you'll see that each event
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    I think the equivalent command line command for
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    In any case, my mini seems to be detecting false overtemp
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    Ok so I installed Leopard last weekend on my Mac Pro and all initially went well with the install. After installation was done, software update appeared and stated I had approximately 4 downloads to install. So I had done this and prepared to reboot. Before rebooting, a window appeared stating that it needed to update the Boot cache. So I clicked on "OK" and the computer went into its shutdown sequence. When the computer reset, I noticed there was no start up chime and the system just sat there with a black screen. I thought perhaps it was updating the boot cache and it may take a while to finish. So I went afk for about an hour and came back. Still nothing. This is when I knew there was something seriously wrong with my system.
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    Wow, who are you dealing with? The first time my logic board was replaced, the techs never bothered with looking at anything else as being the problem. However, when I pointed out the power supply fan problem, they focused on that being the cause of the problem and fixed just that. I was somewhat concerned as I know some of these techs do not look at other parts of the machine as potential problem causers. I was afraid that I would hook up my system only to experience the same problem as before. Luckily, that was not the case.
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    This whole ordeal makes me question the quality of parts used by Apple. My brother has an iMac G4 where the hard drive died after 2 months of getting it new. Now this issue with mine and yours with the bad logic board and the power supply fan. Who knows how many other customers report hardware related problems?

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