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My Imac keeps shutting off right in the middle of operation, then won't come back on for days

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More than likely you have a power supply that is going bad.

Posted on Sep 12, 2009

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IMac G5 17" won't shut down


I have minor shutdown problem with mail, won't close or shut down. My ans top left APPLE drop down, force closure, turn of each programme listed. For me works a treat.

Jan 19, 2013 | Apple Computers & Internet

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I need to unlock a iMac running OS 10.6.1


Step 1:

Turn off your iMac G5

Step 2:

Power it back on. Right when you hear the startup sound, hold down Command and S together. This will bring up a black and white terminal prompt.

Step 3:

If at this point, it asks for a password (firmware password), power back down the iMac, change the amount of RAM (remove one stick of RAM and leave the other in), turn the computer back on and when you hear the start up sound hold down Command + Option + P + R. Keep holding until it restarts again. Once it restarts again, let it boot up, then shut it down again and put the stick of RAM back in. This will reset the firmware password and should allow you to continue onto the next step.

Step 4:

Once you are successfully at the command prompt, type the following commands, pressing enter after each line.

mount -uw /
rm /var/db/.AppleSetupDone
shutdown -h now

Step 5:

That's it! Once you boot back up, you should have a brand new administrator account that you can use to access all files and remove other accounts.

Dec 25, 2012 | Apple iMac G5 Desktop

1 Answer

IMac freezes on start-up and won't unfreeze until I unplug USB-connected hardware.


Mine the same, so don't connect until installation complete, then switch on the or plug in the item

Jun 22, 2012 | Apple iMac Z0GF0005F Desktop

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Mac desktop stop at apple loading screen how do i fix this


Try to force quit the Applications
  1. Go to the top right part of the screen and click on the Apple logo.
  2. Click "Force Quit"
  3. Select the Application you are in or all of them and for each click "Force Quit"
If this doesn't work try to restart your iMac
  1. On the back of your iMac locate the power button in the bottom left.
  2. Hold down the button and then the iMac should turn off.
  3. After a minute or so, try to turn the iMac back on again, it should be operating normally.

Mar 23, 2011 | Apple eMac Desktop

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I have a new iMac all in one dual core 3.06GHz 4GB RAM..500GB HD memory....and when I shut down it will not close but keeps saying to force quit my Lexmark printer so it can shut down all the way? Why...


Your printers' app is keeping your Imac from shutting down. You have to quit the printers' app first then shutdown. Some outside vendors' apps (as Lexmark - has a function that prevents you from shutting down computer in case you have stuff printing) You can change that in your Lexmark preferences. And no it won't hurt the IMac, it's just a hassle until you change the printers' preferences.

Jan 07, 2011 | Apple 21.5" iMac Desktop

1 Answer

Shutting down in the middle of presentations


it's overheating from excessive dust or lack of air flow. blow the dust out of it with canned air and make sure all of the vents are free from obstructions.

Feb 02, 2010 | Sharp PGF312X DLP Projector

1 Answer

Sony PS3 just shut off, starts to come back on and


It sounds to me as though your PS3 is overheating. Turn it off and leave it off for a day or so. Unplug all wires and keep it in an area where it will not be insulated. It needs to breath. Keep it somewhere where the hot air emanating from can escape.

Hope this helps!

Nov 27, 2009 | Sony Playstation 3 (PS3) Console

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Sleep vs Shut down


It depends on how long computer is being used in a day.
for general use
you can shutdown your computer once in 2 days but i highly recommend not to put in sleep mode and betting putting in hibernate mode instead of sleep mode.
note: most of simple issues are resolved by restarting PC so you can guess now how important is to shut down computer.

Good luck,

Mar 25, 2009 | Apple 24" iMac Desktop

1 Answer

Imac the older one ball like base


I don't know what is wrong, but I'll bet it can be fixed by reinstalling your Operating System. You will have the option of archiving your old system, and the files won't be touched. 

Sep 22, 2008 | Apple iMac G4 Desktop

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