hp jornada 520 factory reset (when it bugs up and screen won't start)
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Disconnect your HP Jornada from ac power and disconnect it from your desktop PC.
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Use the tip of the stylus to press and hold the Reset button on the back of your HP Jornada.
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While holding the Reset button, press the On/Off button.
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Release the Reset button.
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Press the On/Off button (11) again to restart your HP Jornada. After you restore the factory defaults, you will need to complete the Welcome Wizard and re-establish a partnership with your desktop PC. You may also want to restore data to your HP Jornada from your most recent backup file.