The switched outlet on the back panel is dead. What happened?
These units were originally loaded with 1-amp fuses for the switched outlet. It is likely that you connected something to this outlet that drew more than 1-amp, causing the fuse to blow. This has since been changed and is now capable of handling up to 3 amps. Please take your unit to an authorized service center to have the 1-amp fuse replaced with a 3-amp fuse, which will solve the problem.