My iMac 21.5 shuts down and doesn't restart.  i need to unplug it for it to start again.  what is the issue?

my iMac 21.5 shuts down and doesn't restart.  i need to unplug it for it to start again.  what is the issue?

Reset the SMC (System Management Controller), click here, read the notes and follow the directions.

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    2. Check the diagnostic LEDs, a feature of your iMac G5. See "About the iMac G5 diagnostic LEDs."
    3. If your iMac G5 will not turn on, see "iMac G5: Troubleshooting when your computer won't turn on."
    4. See also the new iMac G5 Support site.
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    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
    I may receive some form of compensation, financial or otherwise, from my recommendation or link.

  • HT1430 New iPhone 4 shut down and wouldn't restart.

    I have a relatively new iPhone, still under the 90 day warranty. Today it just stopped responding. The screen went dark and I couldn't turn it on. I was able to reset it, but was I wondering why it shut down and wouldn't turn back on. Is this a common iPhone issue, or should I have a tech check it over before my warranty expires in two weeks?

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    This is the formal procedure for doing an SMC reset (disconnecting from power and reconnecting)
    http://support.apple.com/kb/HT3964
    so be sure you followed it precisely, instead of just unplugging it. Also, while doing this procedure, you should disconnect ALL cables. If you have been using a crowded or old power strip, connect it directly to the wall outlet, at least initially for this test. Power it up with nothing connected except for the power cord. If it starts up properly, connect just your keyboard/mouse and use it that way for a while. If the iMac is working properly at this point, you should also reset PRAM
    http://support.apple.com/kb/HT1379
    If all is well, add you peripheral devices back, one at a time if possible. If the problem recurs at some point, note which device was added last. USB and FireWire devices can become defective, or otherwise interfere with sleep, wake, startup, and shutdown.
    If the problem still occurs, even after the SMC reset when you power up with nothing connected (except the power cord) or when you are using it with ONLY your keyboard/mouse connected, you should have it looked at by a technician at an Apple Store or Apple-certified repair shop. If you got it January 2009, it is still under the one-year warranty.

  • IPhone 6 unexpectedly shut down and doesn't power back on

    So today, Febraury 10th, 2015, my IPhone 6 unexpectedly shut down on me and it will not power back up. I was charging my phone in the car and when I was about to get out, I disconnected the charger from my phone  (which was already on and on 56%) . A few seconds later, it just shut off. I tried holding the power button, nothing happened. I connected back to the charger, nothing happened. I took it back off the charger and waited 20 min and tried to turn it back on , nothing happened. I switched Lightning cords, and still nothing. I have ran out of ideas and am beginning to get frustrated. So two questions: Is this becoming a common problem? and what can I do to fix this?

    Hello acameron10,
    Welcome to the Apple Support Communities!
    I understand that your iPhone shut down on its own and now will not respond or turn on. I know you have already completed some great isolation and troubleshooting steps as well. To continue troubleshooting, I would suggest working through the steps in the attached article, including reseting your device and restoring using recovery mode. Please let me know the outcome of these troubleshooting steps and if the issue continues. 
    If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on - Apple Support
    Have a great day,
    Joe

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    It is not unusual for an iBook with the known _logic board problem_ to start up from time to time, but not reliably.
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