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How can I fix it?

I tried to change date and time on my jcmgoldg250 cash register,now nothing will register at all and cannot get it out of prog mode.HELP.
Ruthy, June 2013
I haven't worked on a G250 but your manual should show how you exit from programming. On most models it is the no sale button. If you have a PDF copy of the manual or can scan it into the computer and send it, I can help you further.

Registerman, June 2013