Question about Apple iMac G5 Desktop

1 Answer

Imac won't turn on

Started having trouble turning computer on a while back. Some times it came on sometimes it didn't. You could press the switch a number of times with no results and then finally it would come on.

I just went threw the instrution on this page:
http://www.fixya.com/support/t1490253-apple_imac_17_model_a1058_turn

The #1 LED was on but the internal button would not turn the computer on.

Can you help?

Posted by on

  • dmdobbin Jan 17, 2009

    Pressing and holding doesn't work either.

    It didn't crash or power down. It won't start up again after it has been properly shut down.

    Thanks for your help.


    Dennis

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1 Answer

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  • Expert
  • 121 Answers

Dmdobbin, To restart after a "crash" or an "unexplained" power down, press & hold in the start button, don't just press it over and over, press and wait until it comes on.  Same for a shutdown when all else fails if you can't force quit an application and every thing is locked up. let me know if that does it. randy320sgi

Posted on Jan 17, 2009

2 Suggested Answers

MacApplePi
  • 81 Answers

SOURCE: Apple iMac 17 Model A1058 won't turn on

Re the light turning on for about 3 secs.
Does the computer make a 'start up' chime or any other tones?
If not, this could be for a variety or reasons.
Firstly you need to verify that the power supply is working. Remove all connections from the computer including the keyboard and mouse. Try to start up again. If the computer still fails to start up, you will need to gain access to the computers internals.
Lay the computer face down on a soft cloth to protect the screen. Undo the 3 silver screws on the lower edge of the computer. (one at each end and one central. These are captive screws.)
Lift the rear cover away from the main body of the computer.
On the Logic Board there are 4 diagnostic LEDs indicated by a yellow arrow on the board. To the left of these LEDs there is a small button. This allows you to power on the computer with the rear cover removed. Connect the power lead. LED1 should be 'ON'. If it is 'OFF' then you need to replace the power supply.
Turn the computer on by using the internal power button.(LEDs 2&3 should now be 'ON'. If LED2 only comes on momentarilty then replace the power supply).
Does the computer start up normally after pressing the internal power button?
- Yes: Press and hold the power button until the computer powers off.
• Unplug the power cord from the iMac, and reinstall the back cover.
• Return the computer to the upright position.
• Plug the computer back in, and press the power button to turn on the computer.
• Make sure the computer is starting up properly. If the computer will ONLY start up
from the internal power but will not power on from the power button on the back
cover, the power button on the back cover may be faulty.
- No: Reset the SMU.
• Unplug all cables from the computer, including the power cord.
• Wait 10 seconds.
• Plug in the power cord while simultaneously pressing and holding the power button
on the back of the computer.
• Let go of the power button.
• Press the power button once more to start up your iMac G5.
If the computer starts up normally then shut down and replace the rear cover.
If you feel uncomfortable about working on the computer, take it to a reputable repairer.
Hope this helps.

Posted on Jan 05, 2009

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Sounds like you need to reset your SMU and NVRAM:

To reset your SMU:
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If all else fails, you may need to visit your local Apple retail store Genius bar or local Apple-authorized service center in order to have your iMac at least diagnosed to find out what the core issue is.

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Apple iMac 17 Model A1058 won't turn on


Re the light turning on for about 3 secs.
Does the computer make a 'start up' chime or any other tones?
If not, this could be for a variety or reasons.
Firstly you need to verify that the power supply is working. Remove all connections from the computer including the keyboard and mouse. Try to start up again. If the computer still fails to start up, you will need to gain access to the computers internals.
Lay the computer face down on a soft cloth to protect the screen. Undo the 3 silver screws on the lower edge of the computer. (one at each end and one central. These are captive screws.)
Lift the rear cover away from the main body of the computer.
On the Logic Board there are 4 diagnostic LEDs indicated by a yellow arrow on the board. To the left of these LEDs there is a small button. This allows you to power on the computer with the rear cover removed. Connect the power lead. LED1 should be 'ON'. If it is 'OFF' then you need to replace the power supply.
Turn the computer on by using the internal power button.(LEDs 2&3 should now be 'ON'. If LED2 only comes on momentarilty then replace the power supply).
Does the computer start up normally after pressing the internal power button?
- Yes: Press and hold the power button until the computer powers off.
• Unplug the power cord from the iMac, and reinstall the back cover.
• Return the computer to the upright position.
• Plug the computer back in, and press the power button to turn on the computer.
• Make sure the computer is starting up properly. If the computer will ONLY start up
from the internal power but will not power on from the power button on the back
cover, the power button on the back cover may be faulty.
- No: Reset the SMU.
• Unplug all cables from the computer, including the power cord.
• Wait 10 seconds.
• Plug in the power cord while simultaneously pressing and holding the power button
on the back of the computer.
• Let go of the power button.
• Press the power button once more to start up your iMac G5.
If the computer starts up normally then shut down and replace the rear cover.
If you feel uncomfortable about working on the computer, take it to a reputable repairer.
Hope this helps.

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