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Heat dissipation
Authored by: professor on Sep 06, '02 11:34:03AM

s/extending the useful life/shortening the useful life/

Powerbooks dissipate heat by convection through the keyboard.
If you run it with the top closed, you will SERIOUSLY shorten
the life of your powerbook. Apple even issued at TechNote on this.

Under normal circumstances, a modern LCD screen will long outlast
the useful life of your 'puter (and typically will outlast a CRT monitor).

Even if you weren't liable to do serious damage to your powerbook
by running it with the top closed, "saving the LCD screen" would
not be a valid reason for doing so.



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Heat dissipation with PB G4 & Pismo
Authored by: dzurn on Sep 06, '02 06:19:29PM
Here's the tech note (updated April 2002) which specifically states that running with the clamshell closed and using an external monitor is OK for PowerBook G4 and PowerBook (FireWire) (aka Pismo) models. Although when I am using it at home I have a tiny external fan cooling it all the time, so even multi-hour work sessions don't get it warm enough to start the internal fan.

OK, multi-hour game sessions, but the computer thinks it's work! ;)

http://docs.info.apple.com/article.html?artnum=88064



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Heat dissipation
Authored by: Nikkor on Dec 04, '02 10:40:40AM

The top only has to be closed for the wake-up. Right after that you can open it and it will stay turned off until the next wake-up.

If you want to be sure you can open the top a bit for additional cooling.



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Heat dissipation
Authored by: billfew on Jan 13, '03 07:14:10PM

According to page 47 of the owner's documents for my new 1Ghz powerbook.

Lid closed is perfectly fine and even listed as an option for operation.

Bill



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