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HP Designjet Z2100 Photo Printer
macOS 10.14 Mojave

I had a technician in to help replace a carriage belt that was falling apart. Once finished, we noticed that the Front Panel Display would not light up when we restarted the printer. We doubel/triple checked the connections, but in the end the printer panel won't even light up. The power button is lit up, the panel is not. Can anyone suggest a solve here? 

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