Toggle view between LCD to external monitor on Mac systems

I have this client that his PowerBook G4 mac computer has a very dim light after dropping. Checking the computer further, I found out it has something to do with the LCD screen and a replacement needs to be done. The workaround for this problem, if he don't want to replace the LCD is to connect the computer to an external monitor. How do you do that? To set the view on the external monitor, for newer systems, when booting up, press

Command + F1, press for 2 or more seconds,

until the view toggles from the LCD to the external monitor. For some systems, all you need to do is to press on

F7 hold it down while powering on.

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