Dick Grable tapped out this message on 2/4/2003 4:29 PM >The very first sign of trouble is one of the USB ports not working >properly. Apple replaced the motherboard (4 times now) in a five month >period. What's causing this is a complete mystery to me and the Apple >techs. All external USB and F/W devices are either self powered or >plugged into a powered hub except for the mouse. This is not very encouraging and I am just going to have to hope it has something to do with a dead PRAM battery or powercord and not the machine itself.