Power Mac G5 Dual CPU crashing / not booting. Ideas?

[jafingi]

I have a 2005 Power Mac G5 with Dual CPU's (think it's the 1.8 GHz version). Sometimes it doesn't boot; when I press the start button, no boot chime, and if I leave it on for awhile, the fans fires up at 100%. If I do a force shutdown, and start it a few times, the boot chime comes up, and it boots correctly to the desktop.

Here, I would think that it could be a PSU issue, but wouldn't it be totally dead if it was the PSU? Because I can get to the desktop on 7/10 tries.

But it also sometimes freezes while using it. It just freeze the current picture, and I cannot do anything. If I leave it on, the fans fires up again.

So I'm more thinking about if it's a RAM issue? What do you think? And have anyone else have had issues like these?

Thanks!

 

[ctmpkmlec4]

Do you have access to the AHT disc for your particular G5? If so, you might run the diagnostic and see if anything fails testing. I suspect it being an issue with the CPU or RAM. Have you replaced the PRAM battery lately?

 

[Altemose]

I have had similar issues caused by faulty RAM. Even just one misbehaving stick can crash a computer, and it is even more so important in a machine that requires constant matched pairs.

 

[jafingi]

Do you have access to the AHT disc for your particular G5? If so, you might run the diagnostic and see if anything fails testing. I suspect it being an issue with the CPU or RAM. Have you replaced the PRAM battery lately?

Unfortunately not. So can't run the diagnostic.

Replaced the battery a month ago with a fresh one.

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I have had similar issues caused by faulty RAM. Even just one misbehaving stick can crash a computer, and it is even more so important in a machine that requires constant matched pairs.

I've ordered two new pairs of RAM. So going to see if that helps hope it's not the CPU/PSU. If that's the case, I might just bury it.

 

[Altemose]

Report back with how it works out.