To reset the A Series unit... power down the unit. Then PRESS AND HOLD the #1 Soft Key (left most button on below the display window) while you power up the unit. The unit display will come up quickly... then will go to a white screen that says " RESET IN 3...2...1...". Screen will then kick off. That is the MASTER RESET of the unit.
If you continue to see the unit lock up after that, if you have a seperate chart card that you use (Navonics), try running the unit with and without the card. You may find that the Chart Card is causing the unit to lock up. If not, you likely will have to send in the A50D for repair to NH.
Good Luck!! :)
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