A main power source portion generates a primary DC power from an input AC power, and a first sub power source portion generates a power source control secondary DC power from the primary DC power. Each of a plurality of second sub power source portions, upon input of an activation signal, generates an equipment secondary DC power from the primary DC power. A sub-power-source control portion starts to operate upon receiving the power source control secondary DC power. The sub-power-source control portion outputs the activation signal to a display-related second sub power source portion with higher priority when the detection result of a power state detection portion satisfies a predetermined unfavorable condition, than when the detection result does not satisfy the unfavorable condition, and outputs an alarm signal to cause display-related equipment to output an alarm.