Why no power to monitor?

Hi, I have a b/w G3, with the huge blue monitor. The monitor is not getting power. The button on front doesn't light up. The computer starts up with the keyboard power button, and it will also start if the keyboard is plugged in the the monitors usb....but the monitor does nothing. I've recently replaced the battery too. It was working just fine, until it was moved to a different desk. I gave this to my son's school, and now it's giving them trouble. Any suggestions?

Have they tried a standard power cable to an outlet, instead of the Apple cable that only plugs into the monitor power plug in the back of the G3's power supply?

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