i have an 867MHz G4 with a 17" Apple studio display. the keyboard is plugged into the back of the display and last night the keyboard woudn't work. This morning it did and tonite it doesn't so i plugged it into the firewire port on the processor. Do the firewire ports on the back of the display malfunction? I've had this system since '02 and never had a problem until yesterday. Anyone else experience this problem? Thanks