iMac Intel 27". EMC 2309 (Late 2009, Core 2 Duo 3.06 or 3.33 GHz), EMC 2374 (Late 2009, Core i5 2.66 GHz or Core i7 2.8 GHz)

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Why is my iMac randomly going to sleep?

My iMac began randomly going to sleep a month ago. I reset the SMC multiple times. It stopped doing it for 2 1/2 weeks. Then it went another week without doing it. Now it's done it 10 times in the last 2 hours. Any ideas why? it does it while I use it and I have to use the power button to wake it up.

Console:

1/22/13 4:53:00.218 AM powerd: PMScheduleWakeEventChooseBest: m=0.00 s=0.00 a=0.00

1/22/13 4:53:06.000 AM kernel: AppleBCM5701Ethernet: 1 4 compare_link_settings - failed flowcontrol check

1/22/13 4:53:06.000 AM kernel: Ethernet [AppleBCM5701Ethernet]: Link down on en0 (wol enabled)

1/22/13 4:53:07.000 AM kernel: Ethernet [AppleBCM5701Ethernet]: Link up on en0, 100-Megabit, Full-duplex, No flow-control, Debug [796d,2301,0181,0000,45e1,0000]

1/22/13 4:53:07.733 AM configd: arp_client_transmit(en0) failed, Network is down (50)

1/22/13 4:53:07.733 AM configd: bootp_session_transmit: bpf_write(en0) failed: Network is down (50)

1/22/13 4:53:07.733 AM configd: DHCP en0: INIT-REBOOT transmit failed

1/22/13 4:53:07.733 AM configd: LINKLOCAL en0: parent has no IP

1/22/13 4:53:07.733 AM configd: DHCP en0: ARP detect ROUTER failed, arp_client_transmit(en0) failed, Network is down (50)

1/22/13 4:53:07.824 AM applepushserviced: <APSCourier: 0x7fcdde004a70>: Stream error occurred for <APSTCPStream: 0x7fcdda606e80>: The operation couldn’t be completed. Socket is not connected

1/22/13 4:53:07.000 AM kernel: SMC::smcGetKeyInfoAction ERROR CLWK kSMCKeyNotFound(0x84) fKeyHashTable=0x0xffffff8012247000

1/22/13 4:53:07.832 AM configd: network configuration changed.

1/22/13 4:53:07.832 AM applepushserviced: <APSCourier: 0x7fcdde004a70>: Stream error occurred for <APSTCPStream: 0x10e3364e0>: The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 2.)

1/22/13 4:53:17.000 AM kernel: Wake reason: PWRB (User)

1/22/13 4:53:17.000 AM kernel: Previous Sleep Cause: 5

1/22/13 4:53:17.000 AM kernel: 2847.948783: setDISASSOC from ATH_INTERFACE_CLASS disconnectVap

1/22/13 4:53:17.000 AM kernel: 2847.948791: switchVap from 1 to 1

1/22/13 4:53:18.000 AM kernel: AppleBCM5701::selectMedium - autoselect, any duplex, flow control allowed

1/22/13 4:53:18.000 AM kernel: Ethernet [AppleBCM5701Ethernet]: Link down on en0

1/22/13 4:53:18.228 AM hidd: MultitouchHID: device bootloaded

1/22/13 4:53:19.000 AM kernel: Ethernet [AppleBCM5701Ethernet]: Link up on en0, 100-Megabit, Full-duplex, Symmetric flow-control, Debug [796d,2301,0de1,0300,45e1,0000]

1/22/13 4:53:22.222 AM configd: network configuration changed.

Answered! View the answer I have this problem too

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I believed it is the latest upgrade from apple because i have two partitions one i use and the other is backup, when the problem started I switched partitions and the problem went away

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Found the problem! i placed a jumper on my sata HD drive selection between pin 1&2, restarted and abracadabra, it worked for me, my mac was going to sleep every three minutes now, no more problems

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I gave up 3 days after posting this and just bought a mac mini with a lcd monitor. Lesson learned for me to not buy an all-in-one computer again.

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What happens when you disconnect your network connection (wired and/or wireless)? You appear to have a lot of network events in your log snippet.

Have you made sure your running the latest OS & App updates? Have you checked for Viruses or other nasties taking over your system?

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I haven't tried that. Is it common for the internet connection to go off once the iMac goes to sleep? I have Wake for Network Access checked in the energy settings.

I haven't ran any virus software to check. I'm running 10.7.5

So far no blackouts since I turned down my brightness 5-6 notches. I notice the temperature is also 10 degrees less with everything. I don't think it would be an overheating issue though.

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It now just went black after being on for an hour. This I used control + shift + command to wake it instead of the power button. Much easier.

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I have done some research on this topic and have found that those LCD screens are prone to dying. It is NOT a software issue, it is the LED backlight and LCD Screen itself that die. It fades to black as the LED backlight dies out, keeps your computer still active and will allow your monitor to come back after sleep/shutdown.

For a workaround you can press: Shift-Control-Eject key which will switch from the NVidia drivers to the integrated drivers.

Also some people have found that it is purely a graphical issue: http://reviews.cnet.com/8301-13727_7-200...

Another workaround would be to attach an external monitor and see if you continue to get the black screen on it. If you do, 100% its the graphics card, if not, most likely your LCD is close to death.

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Hi,

I believe this happened to me before. I see that you have reset your SMC, have you tried resetting your PRAM?

Shut down the computer.

Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.

Turn on the computer.

Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

Hold the keys down until the computer restarts and you hear the startup sound for the second time.

Release the keys.

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I reset the PRAM and it didn't work either. I really wish I could figure this out. It seems to be software related some how because it goes black (sleep) but my music still plays and everything else. It's also weird how it was fine for 2 1/2 weeks and then came back again. I have reduced my brightness down 6 notches and it hasn't gone black yet, but I would still like to figure out the problem.

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I found that my vent was caked with dust. As soon as I cleaned it, this problem stopped.

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I have a 27" iMac with a Radeon 5750 card. The combination mentioned above (Ctrl-Shift-Eject) seemed to do nothing, but when I pressed just Ctrl-Shift immediately afterwards, the screen came back for a few seconds. Experimenting, I tried the sequence again but pressed Ctrl-Shift twice. Now the screen is staying on. I hope this helps someone.

UPDATE: That worked for a while, then the problem came back.

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scott will be eternally grateful.
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