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John Duxfield Posted on Apr 15, 2010
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I have a iMac G5 powerPC which is not booting up. Investiagtion online has shown that the PRAM needs to be reset. However when I change the RAM configuration and press and hold command-option-p-r, it is supposed to chime 2 or 3 times which indicates the pram has been reset. But I don't get the chimes. Any suggestions?

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Jason Johnson

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  • Apple Master 1,619 Answers
  • Posted on Apr 16, 2010
Jason Johnson
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You must remove the back panel and press the pushbutton on the motherboard by the 3 leds. If that does not work then you may have the dreaded power supply or capacitor failure. Search the web and youll understand. There are some fix it web sites but if you still have applcare take it in to a apple store and they may repair or even replace the unit.

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Step 1:

Turn off your iMac G5

Step 2:

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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.

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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
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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
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