I have a wireless home network almost working..... On my i-mac running 10.3.2, the "personal file sharing" box in the system preferneces won't stay on/checked no matter how many times I try to turn it on??? It used to work??? This I-mac is one of three computers on a network and the only one w/out an airport card. It's connected directly to the airport base via ethernet???? What Gives? Please, doesw anyone know this answer?