It is possible, there are programs out there that will allow you to to keep the powerbook awake with the clamshell closed. HOWEVER, I wouldn't recommend doing it, as it will create head dissipation issues. The PB's already run a bit on the warm side, so restricting its ability to get rid of heat is not the greatest idea. but to each his own.greggy245 said:I have a 17" PowerBook G4. I am looking at getting an external desplay. Does anyone know if I can use the display with my powerbook closed? Or do I have to keep my laptop open? Thanks!