Firstly, try this:
Turn key to PROGRAM mode
Turn power off at wall
Hold RECEIPT FEED down - keep holding it
Turn power on at wall.
Wait 10 seconds
Let go of receipt feed.
Press SUBTOTAL once
If display does not come on,
Turn power off at wall
Turn key to REG mode
Take one battery out.
Wait at least an hour.
Turn power back on at wall
(you will now need to fully reprogram it at this stage)
If it is still dead, let me know
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