Firmware update made fans run at 100%, can I downgrade firmware?

I bought a 2nd hand PowerBook G4 dvi 12" 1GHZ. It used to run Panther fine. Installed Leopard, ran software update and ever since the fans are on 100% (temps are all about 40 degrees C., that looks fine).
A reinstall and all pramvrampmu resets didn't help.
G4fancontrol didn't help.
After 10.3.7 added 5 kext files that did something with fancontrol. Some folks removed these and then it worked, not with me.
Even disconnecting superdrive, hdd and modem still makes the fans go 100%.
Hardware test from original cd crashes, so I can't use that.
Problems started after the firmware update (now at boot rom version 4.7.5f1). So I guess if I could downgrade to an older firmware version my luck would change.
- Could I downgrade the firmware?
- Where would I get an old version of the firmware?
All thoughts and ideas welcome of course

Hi drrdave and Welcome to the Apple Forums...
You might want to update to 10.5.4 and see if that takes care of it.
http://www.apple.com/support/downloads/
Carolyn

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