You need a FW connection, not a USB. Paul Moortgat On 21 May 2009, at 13:12, Dale Hoffman wrote: > I'm going to install an OS on an external USB drive and use it to > boot a friends iBook G4. > Currently it won't start so I can't choose Startup Disk from > Preferences. > Will his laptop respond to "Option" key at startup for choosing an > alternate? > > Also, any trick to replacing a laptop HDD? > > Thanks, > Dale