[X4U] G5 Fan Run Amok

[John Baltutis]

On 10/20/05, Stephen Lanza <slanza at ptd.net> wrote:
>
> I have a dual G5 2.0 that has been experiencing an unusual fan problem. On
> random occasions where I haven't used the machine for a while (like
> overnight), I come back to the machine to find the fan running continuously
> at a high speed.
>
> The system looks like it is asleep with the display turned off but if I try
> to wake it up by pressing the mouse button or a key on the keyboard
> absolutely nothing happens.
>
> The only way to get out of it (so far) is to hold down the power button for
> 5 -1 0 seconds to power down the machine. A subsequent press of the power
> button restarts the machine normally.
>
> My questions are:
>
> - Is this a known problem? I searched the Apple Knowledgebase but couldn't
> find anything that matches the conditions except for references to resetting
> the SMU to deal with fan problems.
>
> - What is causing the fan to run wild?
>
> - Is there a log file I can check to see if anything is wrong once the
> system is restarted.
>
> - Is it possible that the machine is being damaged by this condition? Should
> I be worried that the machine will go belly up at some point?
>
> Thanks for any help.

See the results from this search:
<http://search.info.apple.com/?q=%22fan+noise%22&search=Go&lr=lang_en&search=Go>.