If you have a PowerBook with a dead LCD panel, it is of course possible to recover the motherboard to turn it into a desktop machine. As shown on the photo below, a simple plastic box will be sufficient:

If you want to know more :
http://www.entremaqueros.net
The step-by-step procedure is in Spanish but with Babelfish, one can get a understandable translation:
http://babelfish.altavista.com