Dear Mr. Krabby,
I've checked this site for a response 5 times daily or more since I posted my iMac problem Saturday November1, 2008. Nothing as yet. I'd like some advice, please, if you're willing to share. Have already taken my iMac in for repair which I've been told is the power source. I've got no knowledge base- could you please help. In addition, "guest" has the same problem. You could get a two-fer if you're so inclined. :)
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This is usually due to the BIOS/Clock/CMOS battery dying. If the battery is dead, it won't start up at all.
Check out YouTube for instructions on opening your model, and replacement batteries are available at just about any Radio Shack, or online at various places. These guys may have them, too: http://www.headgapstore.com/
First, you should make sure you you have power to the iMac. Next if you checked you don't have power the iMac and you do, you could bring it to an Apple Store near you so they can diagnose it. Note, " I pretty sure they could diagnose it." Then if they know what the problem is, you could buy the parts needed from sites that have them and replace the faulty parts. You might be able to find how to replace the parts on www.iFixit.com. If this isn't what you are looking for you should probably clarify your qustion because the question has tons of possibilities. Hopefully this can help!!!!
Note: The Apple Store people might be able to fix the iMac for a price.
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 and mouse and turn on your iMac G5.
See if this second procedure helps if the first procedure does not work.
Your problem is hard to diagnose with your current description without knowing where the clicking sound is coming from or exactly what it sounds like, but most likely the problem resides either with the power supply or its connection to the circuit boards. If you have access to any scrapped G3 iMacs to cannibalize for parts at an E-recycling depot, you can probably find just about anything you need, as long as you get the right model, as they changed key components a few times, but, like cars, a lot of parts cross over. The exact model description is on the bottom in really fine print.
In any case, you will have to take it apart to check out the power supply and/or other components, which is a bit tricky without a guide. You can find a really comprehensive Apple iMac G3 service document, for many of the later models, posted at this URL as an 11 Mb PDF file:
Only catch is that to download it you need to sign up for a free SCRIBD account. (It's a document sharing co-op site.) Hopefully this won't result in years of spam. Good luck, and if you figure out the cause, please let me know. (I have about a dozen iMac G3s that I am gradually refurbishing.)
Next time for any older model Apple portables including the MacMINI that no longer has its AppleCare has major issues and need to be fixed, and you have a small knowledge of how to follow instructions and use a screw driver then you should go to ifixit.com. They have the part that you would need and as a bonus to you when you order from them is they send you the how to remove old and replace with new. Step by Step with precise information and so you don't get totally lost in type there is an image to each step. The person who made that site sure did do a great and helpful job. And the instructions to do any of the jobs that is needed is given to all for FREE. You don't need to buy anything from them or give them any info for the free info. ((this is for anyone that might think i am punting for them-which i am-and they don't know i am)) < and i don't get squat from em but the same information you get >
Okay, you probably need a new power supply, this unit had many power supply and logic board problems. 300.00 is a lot for a power supply, 120.00 is the usual cost plus 50.00 labour, and that is canadian dollars, it should be much cheaper if you are in the U.S.