The PowerMac G5 is a desktop computer first produced in 2003 by the Apple Corporation. This guide will review the repair process of an Apple PowerMac G5 model number A1047 EMC 2061 from 2004. It was discontinued in 2006 as part of the Intel switch first to developers then consumers.

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Random Crashes and Kernal Panics

Hi,

I have a dual 2.3GHz Power Mac G5 (Early 2005) which has been working fine up until a few days ago:

I was typing something in Microsoft Word (2008) and the mac froze. I tried to boot it up again but it hasn't worked properly since, when you try booting it up it does one of 4 things:

-> Boots normally (but freezes again after ~30 minutes-1 hour)

-> Plays the startup chime but nothing else (no video or hard drive activity)

-> Boots and plays the startup sound but freezes on the grey apple screen (just before the spinning thing appears)

-> Powers on but doesn't play the startup sound.

I tried troubleshooting the RAM but didn't have much luck. When the Mac is running it shows the proper Dual 2.3GHz PowerPC G5 CPU and 2.75GB of RAM (4x 512MB sticks, 2x 256MB sticks and 2x 128MB ones) on the 'About this Mac' screen. I've also tried resetting PMU etc. but there doesn't seem to be any correlation between what I do and what the Mac does, it just does whatever it wants.

Yesterday I booted it up again using 2GB (2x 1GB sticks) of RAM that I took from my PC (and know to be working) and it recognised the RAM and worked for about an hour before giving me a Kernel panic reading:

System Failure: cpu=1 code=0000000A (Lock timeout)

Latest crash info for cpu 1:

Exception state (sv=0x3de97280)

I have the whole kernel panic photographed but I don't know how much is important (I can type out the rest if needed).

I realise it's an old Mac but it still works great (or at least up until now) and performs fine for what I need it for so I'd be grateful for any help, thanks :)

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Start with boot key combo Command-Option-P-R

https://support.apple.com/en-us/HT201255

Then boot from OS X install disk. Run disk utility disk first aid.

If it shuts down while in the middle of this it may be a thermal issue. Is the fan clean?

How much room is left on the hard drive? Replace hard drive?

Are you installing the RAM symmetrically? Maintaining parity? If there are four slots of RAM, then install on 1 and 3. Equal amounts in both slots. There will probably be a very little 1 next to the first slot on the logic board.

Reseat all cables connecting your hard drives.

Make sure no dust has accumulated on the internal components. Blow off with compressed air if dusty.

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milko will be eternally grateful.
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