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G4 - nothing happens when I press the power button

by Bobananda / August 1, 2010 3:19 PM PDT

Hello, folks at MacFixIt Forum.
I need your help. First things first.

1) The type and model of my Mac:

Machine Model: Power Mac G4 (Gigabyt Ethernet model)
CPU Type: PowerPC G4 (2.9)
Number Of CPUs: 2
CPU Speed: 450 MHz
L2 Cache (per CPU): 1 MB
Memory: 512 MB
Bus Speed: 100 MHz
Boot ROM Version: 4.2.8f1
MacOS: 10.3.9

2) The Operating System is MacOS 10.3.9
3) Ram I have installed is 512 MB
4) Size of hard drive is 38.05 GB (about 11 GB available)
5) Devices you have attached to your Mac are:
Epson printer (R200) with usb connection
Imation super disk dirve (usb - seldom used)

Here is my problem. Earlier today, quite out of nowhere, I went to turn on my computer and nothing happened. I mean nothing. I double-checked everything. It was all hooked up, everything was in place, the monitor and printer came on. But when I pressed the power button on my computer, nothing happened. It worked fine yesterday. I shut it down as I always do, no problems. But today, nothing.
I periodically checked on it, still nothing happened, until - all of a sudden - the power light came on and the computer started. Start-up proceeded normally. The system is operating normally.
So here I am, at MacFixIt Forum, seeking help in understanding just what in the hell happened and what I can do if it happens again.
I looked at some old threads but didn't find one with my particular computer.
Nor do I know much about resetting PMU or PRAM or CUDA, whatever that is.

Thank you.

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First step,
by mrmacfixit Forum moderator / August 1, 2010 9:52 PM PDT

replace the internal battery.
You can get them at Radio Shack.

To reset the PRAM, hold down the Apple (Command) key + Option + P + R at the first chime and hold them down for a further two chimes.
Release and let the machine boot.

Replace the battery first


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Thank you. About the battery...
by Bobananda / August 2, 2010 12:24 PM PDT
In reply to: First step,

...I do not have the specs for this computer. Does anyone know what battery, specifically, is used in this model?
I assume it doesn't cost all that much, but can someone give me an estimate. I'm surviving (barely) on unemployment benefits, so cost is an issue.
Also, is it safe for a nontechnical computer person to go inside it and change the battery without risking some considerable misfortune?

Thanks for the help. This forum is a valuable service for people like me.

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That battery is about $16.00 from Radio Shack
by mrmacfixit Forum moderator / August 2, 2010 10:05 PM PDT
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