G5 fans going mental



Usually this PowerMac G5 is very quiet (much nicer to sit next to than
its Mirrored-Drive-Doors G4 predecessor).

But in the last couple of days, it has been doing a funny thing: when
waking from sleep, all the fans come on and stay on. But a restart sorts
it out, all back to quiet again.

Yesterday it persisted once through a restart. Today I can't get them
quiet at all. They're going mental no matter what I do.

I downloaded a program which prints out information from the temperature
sensors, but none of that seems out of the ordinary.

There's supposed to be some daemon running which tells the fans how
slowly to go (if it crashes, they ramp up to full speed). Does anyone
know what it is called, so I can check that it is running?

Is it otherwise possible to work out why the PowerMac thinks the fans
need to be going at full whack?

Cheers,

Andrew

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