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JCM Gold 4800 Cash register?

The till hums when the power is switched on, but the display doesn't light up. I have switched it on on the side and tried every key. Can anyone help?
Stephanie Patterson, May 2020
It might have a faulty battery or have lost the program for some reason

Registerman, June 2020
link Click here to see other fixes for JCM 4800.