Don’t lift your open, switched-on iBook G4 by the screen (i.e. without any support underneath).
I did the other day, ever-so gently, and the screen stopped working. Now it has cost me 47 notes to get someone to look at it, and more for what ever part needs replaced. This, they say, could simply be the connecting cable (cheap) or the logic board (v. expensive).
Update: It’s the expensive option, dagnabbit!