Fans at high speed even when idle

The fans on my iMac have been running at high speed all the time for a few weeks. I don't know why: I've installed no new software except for system updates. The fans used to be almost silent.
XResourceGraph records the CPU temperature in the high 60s (Celsius) and CPU fan speeds of 5500-6000. The fan speed stays around here most of the time (regardless of how many applications are running - even if I'm running none at all!), and never drops below about 3500.
I've tried:
a) resetting SMU
b) resetting the PRAM
c) vacuuming the inside of the iMac
... all to no avail. Any further suggestions please?
Thanks in advance!
iMac G5 Rev B Mac OS X (10.4.9)

System updates can cause problems like yours, since you have done the most obvious things, I would suggest reapplying the latest update as a 10.4.9 combo updater. Please let us know if that helped,
Miriam

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Hello irisfailsafe
Welcome to Apple Discussions
Reset the SMC > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
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Message was edited by: lynnbee
Message was edited by: lynnbee
Message was edited by: lynnbee

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