Spontaneous Shutdowns

[Eric Dannewitz]

I had my Mac in at MacResq, and they had it for about 6 days. It did 
absolutely nothing for them. I can only assume that this is what the 
issue is/was. I moved the machine so it has more ventilation 
(Quicksilver 933Mhz), and it seems to be a lot more stable.

The problem/error appears in OS X's system log, and shows up if you 
start into the shell (Apple-S). I'm not sure if YellowDog would show the 
error as well.

Have you reset the PMU on the motherboard? Replaced the clock battery? 
Reset PRAM and Open Firmware?

Brian Mayton wrote:

>> Yeah, I had something like this going on with my Quicksilver 2002. I 
>> think it is overheating as well. It would, in OS X, give a message 
>> Apple PMU::Forced shutdown -122............
>
>
> Would there be any way to confirm this?  Some way to log it?
>
> Also, is there a way to get the machine to boot up automatically after 
> such a failure?
>
> I'm still not really convinced it's overheating, as it *is* in a 
> climate-controlled room...  there's a pretty good sized air 
> conditioner in the room and it stays pretty cool.  It also isn't 
> running with very much CPU utilization, no more than 20%, usually.  
> Most of the time it's just sitting around, so it shouldn't be heating up.
>
> This is a machine that ran for months at a time running OS X, using 
> much more CPU in a warmer room with no problems...
>
> FYI, the machine is a 500MHz G4 revision 2.9... detected as "65 
> (PowerMac G4 AGP Graphics")
>
> Thanks for the help so far...
>
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