From: http://docs.info.apple.com/article2.html?artnum=24961

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Because of the PowerBook computer's slim profile and light weight, there may be small vertical marks on its display where the edge of the keycaps touch the glass that covers the display.

The marks may appear on these computers: PowerBook G3 Series (Bronze Keyboard); PowerBook (FireWire); PowerBook G4 through PowerBook G4 (1GHz/867MHz).

These marks are the result of the edges of the keycaps on the keyboard touching the glass that covers the display due to the tight tolerances required by the slim profile and light weight of the PowerBook computer. These marks are not permanent and can be removed by gently wiping off the display with a clean cloth. Periodically wiping off the keyboard and display will reduce the visibility of any marks on the display screen.

If the keyboard in your PowerBook has been lifted up to install RAM (or for any other reason), check to make sure that the keyboard is properly installed. When reinstalling the keyboard make sure all the tabs on the leading edge are fully inserted into their corresponding slots. The instructions on how to remove and replace the keyboard are available from the Help menu. Look for the keyboard instructions in the Installing Memory section.

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Is this a problem on the iBooks? Or is the screen-keyboard distance/tolerance on the iBooks OK? I guess the schools and other big iBook users would notice it first.

Reg, any observations or suggestions? Do you take any special precautions in the schools?

I've been using a chux on my iBook for 2 years to prevent this ... but want to do away with it if it is not necessary. Carrying a chux superwipe around with your laptop is NOT ideal.
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Richard Kay
Fremantle
Western Australia