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Apple iMac 17 Model A1058 won't turn on

My mother has a Apple iMac 17 Model A1058. I'm not quite familar with iMacs..and can't figure out why it powers off, once it's turned on.

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  • linum_usitat Jan 05, 2009

    The light turns on for about 3 secs and than it powers off..the screen never lights up it just remains black...I thought it could maybe be the power cord??

  • linum_usitat Jan 05, 2009

    okay thanks ! It's the power supply, the LEDs2 comes on but the LED3 doesn't.

  • Martin Buck
    Martin Buck May 11, 2010

    Can you provide some more information on this?
    Are there any lights showing after it 'powers off'?
    How long after start up is it before the unit 'powers off'?
    Thanks


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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

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I had the same problem, and the solution was a new power supply. They can be gotten on ebay for about $70, and they're not hard to install.

Posted on Sep 29, 2014

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How to format and install xp professional in apple computer model no i mac A1058

Posted on Dec 29, 2009

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SOURCE: My mother has a Apple

hmm may be a problem with it or the energy saving function is set, click the apple top left and go to system settings, if its not there, check on the task bar (gears picture) or in finder and it basically has the same standby settings as a windows pc

Posted on Jan 05, 2009

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Thanks for contacting FixYa Support.

I have repaired numerous iMac G5 17" models for a while now and because I have, I can tell you just from the symptoms you have described, this is potentially a power supply issue.

However, the iMac G5 17" have been known to have swollen capacitors, which can also ultimately impact the power management / performance of your iMac.

If you are able to, very carefully and don't touch them, you can look on the iMac's main logic board to see if you notice any swollen capacitors. If you are not sure what a capacitor looks like, they look like mini batteries connected to the board.

Should you do this and find that the capacitors are ok, then I would recommend for sure, that you look into replacing the power supply.

For your model of iMac 17" provided it is not an Intel-based iMac, the part number you will need to source is part# 661-3627. Below, I have also provided the most inexpensive price for this iMac power supply per this link:
AppleComponents.com

You may find even lower prices for this iMac 17" power supply, if you search online further, but this is one of the better online Apple components vendors. Therefore you should be able to see and compare the prices on this website, with some of the other vendors
advertising the same Apple power supply for the iMac 17".

I hope this helps. If you have any more questions on this subject, simply reply back to this post.

Best Regards,

-Mactechtrainer

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1 Answer

My mother has a Apple iMac 17 Model A1058. I'm not quite familar with iMacs..and can't figure out why it powers off, once it's turned on.


hmm may be a problem with it or the energy saving function is set, click the apple top left and go to system settings, if its not there, check on the task bar (gears picture) or in finder and it basically has the same standby settings as a windows pc

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Imac g5 model:a1058


iMac G5's cannot run windows alone, but older software can be purchased like Virtual PC to run windows on that unit.

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