"Processor" Preference Pane and whining noise

I used to have a TiBook, which worked fine. Then I bought a MacBook Pro as soon as it was announced, and I was stuck with one of those models that had the high-pitched, whining noise:
(http://www.red-sweater.com/blog/macbook-pro-noise-complaints)
It seems that this noise was coming from the Intel processor in the "naps" it would take. After a year of complaining, Apple finally accepted my computer for repairs and soved that issue.
In the meantime, my mum would use my old Titanium PowerBook and at some point (after some MacOS upgrade???) that one would start doing precisely the same whining noise, too.
The funny thing is that I also noticed the Control Panel exhibiting an additional pane, called "Processor", whereby you could inhibit the hissing and whining noise by unchecking the "allow nap" button. Strangely, I don't have that control panel on my MBP (why?), even though we both have 10.4.11. If I uncheck "allow processor naps", the whine stops, but the computer vent goes off often, which is equally annoying.
So does anyone know the story of why at some point the PowerBook G4 would start having that whining hissing noise? (About the same time when my MBP was cured of it?) And most of all: does anyone know how to return the TiBook to its original state?
(I posted something on the TiBook forum recently, yet the discussion was helpful but inconclusive there:
http://discussions.apple.com/thread.jspa?messageID=6199028#6199028 )

Hi,
I can't comment for most of your questions (as I don't know ) but:
Strangely, I don't have that control panel on my MBP (why?), even though we both have 10.4.11.
The processor panel is added when you install the OS X Developers tools - I assume you didn't install that on the MacBook Pro.

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