Mac goes into sleep mode amd doesnt come out!!!!!!!

Hi, new to this so sorry if this is a dum question. I have installed Snow Leopard on my IMac and Air. No prob on the Air but probs with the IMac. Everytime it goes into sleep mode I get a black blank screen and it wont come back up? have to reboot everytime or leave front row on with a slide show! any ideas welcome?

I looked around the internet and found an old post that seems to have solved the problem.  I had a relatively new USB port (powered) that I unplugged and, ta da, the problem disappeared.  I'm not sure why this happens (I'm not a tech person) but it seems like this should have been worked out in testing somewhere.

Similar Messages

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    My Imac goes into sleep mode but won't come out.  The keyboard/mouse won't rouse it and the power button won't do it either.  I have to unplug the computer, re-plug it in and then hit the power button.  Help?

    I looked around the internet and found an old post that seems to have solved the problem.  I had a relatively new USB port (powered) that I unplugged and, ta da, the problem disappeared.  I'm not sure why this happens (I'm not a tech person) but it seems like this should have been worked out in testing somewhere.

  • HT3205 mac going into sleep mode for no reason

    my mac is playing up. Every time I open it, the screen will appear briefly then flash off as if I have put it on sleep mode. When I close the top and re-open it it does the same thing again, sometimes it works for a while, but will turn itself off again after a few mintues.
    I have tried charging it, turning it off etc and nothing seems to be working. Does anyone know what this means and could help me please?

    Problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset:
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    Shut down the computer.
    Disconnect the MagSafe power adapter from the computer, if it's connected.
    Remove the battery (to remove the battery - click here: MacBook or MacBook Pro).
    Press and hold the power button for 5 seconds.
    Release the power button.
    Reconnect the battery and MagSafe power adapter.
    Press the power button to turn on the computer.
    Resetting the SMC on portables with a battery you should not remove on your own
    Shut down the computer.
    Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
    On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
    Release all the keys and the power button at the same time.
    Press the power button to turn on the computer.

  • My Mac goes into sleep mode while playing videos or DVDs.

    This started happening last week. I was watching Veronica Mars and all of a sudden my computer goes to sleep. At first I though it was because I had it on energy saver mode, but it just kept on happening. Tonight I wanted to watch Camp Rock on Disney XD and after a few minutes it shut down. I went on You Tube to watch my friend's videos and the same thing happened. Does anyone know what's wrong?

    Welcome to Discussions - the problem is probably overheating, which causes your computer to sleep. Look in you Applications>Utilities>Console and see if your System log shows "maximum temperature exceeded for 30 seconds". This would indicate a problem with your Power Supply Unit or a faulty temperature sensor. You should take it in to be looked at.

  • Mac goes into sleep mode

    A few months ago I was had a problem where my Mac was overheating. The geniuses over at the Apple Store told me to put a fan behind it and call it fixed. The error I was getting back then said that there was something wrong with the heat sensor. My Mac shuts down, but the console gives me this now:
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    Sep 15 20:01:09 Stephanies-iMac mDNSResponder: Repeated transitions for interface en1 (192.168.2.2); delaying packets by 5 seconds
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    Although mine is not over-heating (I don't think) my mac has just recently started to "go to sleep"... I would have posted my own post but your title describes what is happening to me!
    This is the post I made to the Using Tiger forum:
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    Is it possible that some key sequence or something is putting it to sleep? Of course, I didn't touch it and it went to sleep. Is this a possible hardware issue? I still have the extended warranty (at home service). Should I have it looked at? Its not a huge deal, but I have it configured to never put it to sleep (I do how the "display" sleep after 2 hours of inactivity though.
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  • Late 2012 Mac mini with OSX 10.8.2 has started shutting down instead of going into sleep mode.

    Sometime in the last week or so my mac mini has started going into full shut down instead of sleep mode.
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    Adding to my first post I can now advise that when the mac goes into sleep mode the light on the front stays on (it does not pulse so clearly it is not really sleeping).
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    http://macs.about.com/od/usingyourmac/qt/Resetting-The-Smc-System-Management-Con troller-On-Your-Mac.htm
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  • Mac Tower Pro  10.8.5 keeps going into sleep mode

    Purchased from Apple, refurbished 2012 Mac Tower Pro.  At the same time, purchased a new Dell U2713HM, 27" monitor.
    Have been operating on this new system since about the first week of December 2013.
    Issue:
    The computer has constantly gone into sleep mode after a few minutes of no activity.  I can have iTunes radio playing, but the system still goes into sleep mode.  As  I am typing and moving the curser, the machine stays awake.
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    Results:
    Nothing.  Problem persists.

    I apologize for the angst.  The problem has cost too much money in lost time and material because when it would automatically shut down after a few minutes, all my work was lost. 
    I misunderstood the terms of the warranty.  Thank you for your input and patience.  Much appreciated.  For the benefit of others that experience this with a new Mac that auto shuts down.  Check the following:
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  • Mac Pro randomly goes into sleep mode

    My (mid 2010) Mac Pro, OS X.6.8, randomly goes into sleep mode and I can't wake it, have to power it off and reboot. Just started to the best of my knowledge Friday (Jan 6, 2012) I've had it happen surfing the web in Safari, while working on an illustration in Adobe Illustrator, while running Apple Hardware Test, using 23" LCD connected by HDMI and DVI-D, Disconnected monitor and connected 12" Cintiq (LCD Tablet).
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    Now reboot as you always do.  Take a look at the fan in your 5870.  Is it spinning?  If so, try to keep an eye on it and see if you can "catch" it not spinning. 
    When the fan doesn't start, or if it does then stops, the card will overheat and the machine will go into thermal cutoff.  The amount of time is variable.
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    Some other temperature monitors:
    iStat Pro
    Temperature Monitor
    Hardware Monitor
    Note, after typing all this I also realized you got a AHT 4SNS error. I would run AHT again to see if you get that error again.  If so that means "Check Main Logic Board" and you may have a more serious hardware problem than just a video card!  So my other recommendation is that when you machine fails again look inside for any lit diagnostic leds.  There's some near the dimms but there are others on the board as well.

  • Unexpectedly goes into Sleep Mode... All the time!

    I've had this Powerbook for about 2 years now, and I've got some problems. About every 5 or 10 minutes, it goes into sleep mode! It acts as if I close the screen, so I wake it up by pressing the spacebar. But sometimes... pressing the space bar doesn't wake it up, not even holding the power button turns it off! I have to remove the battery to restart it! Can someone help please?
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    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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    -/Users/username/Library/Preferences/com.apple.systemuiserver.plist--
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    DALE

  • MacBook goes into Sleep Mode w/o me telling it to

    An iPod-like image pops onto my screen with "Zzzz" coming out of it. Then my computer goes into sleep mode.
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