Titanium PB with fans running constantly except when loading a new OS

Question

As soon as the PB "on" switch is pressed the fans come on and run constantly unless I am doing a startup from an OS Disc. Then the fans do not come on and the machine runs well until the install is complete.
Once the machine restarts after the install the fans come on again and do not shut off until the machine goes to sleep which takes between 10 seconds and a minute.
How do I turn off the fans with the OS s/w and how do I stop the machine from going to sleep within 10 seconds or so of "normal" operation??
This is a most puzzling mode of operation for a PB.

Answer 1

More experiments with the PB G4;
Following some of the leads in the Aluminun PB narcolepsy issue I have used the TDM to extract several extensions from the system library.
AppleCPUThermo
AppleFan
AppleI2C
AppleLM87
AppleThermal
ApplePMU
And the bundle named ;PowerManagementBundle.
Of these the ApplePMU seems to make the most difference. Without it the machine will run for hours, but not at full speed for some unknown reason.
The power down sequence is also not normal since the machine OS will shut down when I tell it to shutdown but the unit will not power off. Turning power off with the power button causes a time reset and the machine will restart when requested as it was before.
This AM I returned the extension for the Fan to the extension folder and the machine still ran but the shutdown sequence was as before.
More on these mods to the extensions later.
I may try these same extension(or similar) experiments with OS 10.4.