EXS 24 Logic Sampler Users Group

Hi everyone, I have the exs24mkII, with the exs instruments on a G4 
powerbook and the samples on an external fire wire drive.  When I am in 
Logic (6.3 3running in OS 10.2) and enter the exs24 window, many of my 
samples fail to load- when enter the drop down menu for the exs instruments, 
and select one, I get an error message saying the "sound file xxxxxxxx can not 
be found."  However, when I go into my fire wire drive, the particular wav files 
(samples) are actually there and can be played individually.  Can any one 
help?

Many thanks!

Peter