Question about Apple Power Mac G5 Desktop

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Mac G5 shutdown and now won't power up

My Mac G5 has shutdown unexptedly and now won't power up. There is no response at all to pressing the startup button. I have unplugged it and reseated all the RAM but it still won't power up. I have checked the battery (which is a round barrel shape 3.6v not a flat round type) on a meter and it shows a poor charge, is it likely this is the problem?

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Sounds like a bad power supply. They do go bad... get a new one and hook it up without installing it. If it boots your machine...you've solved your problem. That battery retains some boot info and your date/time settings.

Posted on Jan 04, 2009

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I am going to recommend a hardware approach first and then a software approach, to this issue, in order to assist you. At the end of these procedures, is a general support link from Apple for additional support for no picture in your iMac G5 display

I am seeing more of such display issues like this, and more often than not, if the problem does not have to do with the firmware, it may be a damaged or corrupted file which can hinder the iMac G5 from normal start up functionality.
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PMU Reset (try this first)

The PMU (Power Management Unit) is a micro controller chip on the logic board that controls all power functions for your Mac.

• Shut down the computer.
• Unplug the computer's power cord.
• Press and hold the power button for 20 seconds.
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This procedure may help but if it does not, follow the procedure below

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-SAFE BOOT MODE-
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(NOTE: this may take anywhere from 5 to 15 minutes to load to the Safe mode screen depending on the performance of your Mac, but if it exceeds this time, shutdown your Mac and try just once more. It may have just frozen up the first time around for you.)

• You are going to enter the Safe Mode (which looks like your main desktop environment - the only difference is certain startup items are disabled.)

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• This path, is going to take you to the System Library folder which has all of your Mac OS X Startupitems.
• Remove all of those folders to the Trash.

*Reboot your Mac normally and see if you can access your normal User desktop environment.

One of these two procedures should help resolve the blank display issue you are experiencing,

Additional Support Link:
Apple Support iMac G5 - No picture on display


Regards,

-Mactechtrainer


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During startup in Mac OS X 10.2 through 10.3.9, you will see "Safe Boot" on the Mac OS X startup screen.

To leave Safe Mode in any version of Mac OS X, restart the computer normally, without holding any keys during startup.

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