[X4U] G5 Fan Run Amok

[bombino episimos]

I hope you are still under warranty.

I started having a similar problem.  [Looooooooong list of woes followed.]
It ended up being the logic board, which had to be replaced because it
wouldn't accept the thermal calibration which controls the fans.

FWIW:  After 5 trips to the repair shop, Apple has agreed to replace my dual
G5 2gz.  I hope your repair is more successful.  Possibly just a thermal
calibration is necessary.

Bob


On 10/20/05 6:24 PM, "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.
> 
> Stephen Lanza
> Software Complement
> 
> 
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