Question about Apple iMac G5 Desktop

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I have an apple imac g5. It won't turn on.

The computer won't turn on. the power cord is good. Any suggestions?

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It's probably burned-out electrolytic capacitors in the power supply section or on the logic board (to other technicians on this board, yes they do burn out - cut one apart and you'll see the paper around the plus lead is turned to charcoal). Those are relatively low-cost components ($0.40 - $1.60, depending on the size), but require technical expertise to replace (ability to change parts on multi-layer boards with lead-free solder, and observe electrostatic discharge precautions to prevent damaging the board). Burned-out electrolytic capacitors are often readily identified by visual inspection - the tops will be bulged out and often have material leaking from the vent. In the photo below, a bad capacitor is shown next to several good ones.
I have an apple imac g5. It won't turn on. - section-mrzm0azsfe5zcvjoln010u0z-4-0.jpeg

If this is the case, insist that your repair technician select new capacitors for high ripple current and endurance (at least 8000 hr. rating) as well as the same or better temperature rating. I've found the Panasonic FR1 series capacitors work well for this application. United Chemi-con's EKZN series should also be adequate. They may cost a few nickels more than other brands, but the money is well worth spending.

Posted on Nov 30, 2014

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  • 82 Answers

It could be the internal PSU that has failed. Take it to a Mac repairer.

Posted on Nov 25, 2014

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SOURCE: MAC EMAC G4 & IMAC G5 power supplies

Is this a tower or Imac?
Is there a reason other then curiosity you need to know?

All power supplies have it labeled on them what they are if you need it.

Posted on May 05, 2008

MacApplePi
  • 82 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

  • 3 Answers

SOURCE: iMac G5

If it isn't the power supply, some of the early G5 imacs had a capacitor failure issue...mine just died, in fact. It was just shutting off by itself, even turned on once by itself....but tonight, when it shut down, it would not restart. I opened it up and looked and sure enough, 11 bulging/leaking capacitors. My local service center says there are two options: 1. new mother board-aprox $500 or replacing the capacitors- between $170-200. Until Dec 15, 2008..this was apparently covered under a special warranty extension program Apple had....typical!

Posted on Mar 07, 2009

Macs R We
  • 481 Answers

SOURCE: imac g5 17 gets some power but no display

Assuming you have the model with four diagnostic LEDs, the lack of LED-3 indicates that the computer and the LCD display are NOT communicating. This LED should be ON when the computer is turned on and video signal is being generated.
The first solution is to reset the PRAM (hold command-option-P-R after the boot chime until you hear another boot chime). If video does not appear, then power down the computer and reset the SMU by pressing the SMU button ONCE ONLY. (The SMU button is located just south of the fan housing and is the button further away from the fan; the other button is a power button.) If this does not fix the video, the next step is to remove the optical drive. If this does not fix the video, put everything back together and attach an external display using the dongle supplied with the unit. If the external display fails to work, you have a logic board problem; otherwise, you have an LCD panel, inverter, or cable problem.

Posted on Apr 02, 2010

  • 29 Answers

SOURCE: my iMac G5 won't start.I get the start-up sound,

try to start up the computer without any cable connected on it, maybe the keyboard is making the problem, or the mouse too

Posted on Aug 12, 2010

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Never heard of before, though power there.

Guess, try holding the on/of switch in a little longer, some systems act as reboot/reinstall

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You will need to acquire and install a new power supply. I would suggest having a professional do it, being the iMacs are difficult to work on and not for the novice.

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Ok, the school where I work was having an electronics recycling drive and one of the other labs recycled an iMac G5 A1058. I have a friend who needs a new computer, so I took it, got a new hard drive for...


Bad capacitors often cause the no-turn-on problem. This page has a good picture of what bad caps look like in the G5. If you see this trouble in your G5, you might be able to get this going. Kits of capacitors are available (here's the place I got some from) and If you're comfortable with electronic soldering and replacing parts on a printed circuit board, changing out the duds may be all that's needed. I've seen three of these now. On one, there was just a single bad cap that was keeping the computer from starting up. It's certainly worth looking into.

Jun 13, 2011 | Apple iMac G5 Desktop

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Apple 20 in Imac G5 turn on for about 40 second and shut it down itself .. please help


Sounds like you need to reset your SMU and NVRAM:

To reset your SMU:
  1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
  2. Unplug all cables from the computer, including the power cord.
  3. Wait 10 seconds.
  4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
  5. Let go of the power button.
  6. Press the power button once more to start up your iMac.

To reset your NVRAM:

  1. Shut down the computer.
  2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys.
If those don't resolve the issue, your computer will probably need service. Good luck!

Oct 10, 2010 | Apple iMac G5 Desktop

1 Answer

G5 keeps powering up for a few mins then switches off?


Thank you for contacting Fixya Support, I am glad to assist.

There are a few steps you can try to troubleshoot this issue:

Try a PMU Reset:
* Turn of your iMac if it is already turned off
* Disconnect all connections to the iMac except the power cord
* Now disconnect the power cord for approximately 20 seconds
* Reconnect just the power cable the keyboard, mouse and power cord, and then power your iMac G5 up.

* Check to see if the iMac boots up normally without power interruption.

* If the iMac G5 shuts off again, try these steps, another recommendation would be to remove all connections including the power cord, and lay the iMac G5 on soft cloth face down and with a philips screwdriver, remove the plate on the bottom of the iMac G5 where your RAM memory is located.
Before removing the RAM however, touch your hand on the metal boot to discharge any static current you carry for approximately 5 seconds.

Now remove each RAM card and then reseat (re-install) each card.

Restore the RAM card cover with your Philips screwdriver, reconnect your power cable, keyboard an
d mouse and turn on your iMac G5.

See if this second procedure helps if the first procedure does not work.

Let me know if this helps.

Regards

-Mactechtrainer

Sep 11, 2010 | Apple iMac G5 Desktop

1 Answer

My G5 imac, will NOT turn on. And all elec cords and power, have been checked.


Most likely its the power supply or the video on the mainboard. It is a cheap capacitor issue that was addressed. Warranties were extended. If you have an apple store near you and your unit is less than 4 years old you may qualify for free repair or replacement. You could call apple to find out for sure but sometimes the apple stores will just do it out of loyalty.

If you go to the apple web site search support for G5 imac and there are some troubleshooting tips.

May 14, 2010 | Apple Computers & Internet

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All of a sudden, my iMAC wont turn on.. Any suggestions???


It is best to check with an Apple store, assuming there is one within 100 miles or so, especially if you are under AppleCare, yet--unlikely. My 20" iMac G5 gave up the ghost a year ago. Their cost to repair/replace the logic board was >$800. I've heard 3rd party as low as ~$500. I decide to change to an MacBook 13" (Early 2009 white, then current) and love its convenience.
Try the Macintosh boards where I have posted http://discussions.apple.com/category.jspa?categoryID=134 "Apple - Support - Discussions - iMac G5". No luck for me though. If you have the early G5 that I have, pull power plug and any cables, place face on non-scratching surface, rotate 1/2(?) turn the 3 screws on the bottom, lift off the back and stand, use the power cord to try to start it. There is a button for this but varies with models. If only one LED lights or 2 for a short time you may have my problem. First, after the back is off check if the capacitor tops are bulging. If so that is a known repair, but its coverage expired.
-Ken

Apr 11, 2010 | Apple iMac G5 Desktop

4 Answers

17" iMac quit working



Your Imac may be one of those affected by Apples purchase of inferior capacitators from Taiwan. If you are less than 3 years from the purchase date, apple will repair the problem for you for free. Just take the unit to your nearest local Apple Genius or tech. If you are outside of the repair extension guidelines, I have provided a link here which can show you or someone more skilled how to repair the problem. Ordering a new motherboard and power supply will set you back a lot of money, however the following guide and pdf give you step by step instructions on how to ressurrect your dead imac without speding more than $100.00. I was able to repair my imac using this guide and it was worth it to save a $2k computer that was only 3 1/2 years old. Check it out:

the following information (in italics and bold)  is taken directly from: http://www.jimwarholic.com/2008/07/how-to-repair-apple-imac-g5.php.  (this site is complete with instructions, manual and the full compliment of materials available at an extremely affordable and fair price. I took a chance and repaired my own, it is not as hard as it sounds1)

The iMac G5 Repair Extension Program for Video and Power Issues applies to first generation iMac G5 computers that have video or power-related issues as a result of a specific component failure. If your iMac G5 is exhibiting any of the symptoms listed below and your computer's serial number is within the noted ranges, your computer may be eligible for repair, free of charge. If Apple or an Apple Authorized Service Provider (AASP) determines that your iMac G5 computer is eligible as part of the program, the repair will be covered by Apple for up to three years from the original date of purchase even if your iMac G5 is out of warranty.

This is a worldwide Apple program.
Affected systems will exhibit one of the following video- or power-related symptoms:
Scrambled or distorted video 
No video 
No power 
Note: If your iMac G5 is not experiencing any of these symptoms, you do not have to contact Apple or any Apple Authorized Service Provider.

Which iMac G5 computers are affected by the iMac G5 Repair Extension Program for Video and Power Issues? 
The program is available for certain first generation iMac G5 models that were sold between approximately September 2004 and June 2005 featuring 17- and 20-inch displays with 1.6GHz and 1.8GHz G5 processors.

The affected iMac G5 computers have serial numbers where the first 5 digits fall into the ranges noted below.

Serial Number ranges:
W8435xxxxxx - W8522xxxxxx 
QP435xxxxxx - QP522xxxxxx 
CK435xxxxxx - CK522xxxxxx 
YD435xxxxxx - YD522xxxxxx 
Some second generation iMac G5 computers have serial numbers that fall within the upper band of the ranges listed below. Only first generation iMac G5 computers are affected by this program.


Where do I find the serial number of my iMac G5?
The 11-digit serial number is located on a label under the foot of the iMac G5. There is a bar code underneath the serial number.
To view the label, hold the sides of the iMac and gently lay the computer face down on a soft, clean towel or cloth.



Is the iMac G5 Repair Extension program available for other Apple computers? 


This program applies only to the systems noted in this FAQ. Other versions of the iMac G5 line are not part of this program. Click here for more information on how to identify iMac G5 models

Free guide for how to repair the motherboard capacitors, rescue the hard drive and more.

http://www.jimwarholic.com/docs/Repairing-Apple-iMac-G5-Motherboard.pdf

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IMac G5


you need to contact apple support for the same

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