HP Officejet 4500 - Error message appears on control-panel display

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Error message appears on control-panel display

A non-recoverable error has occurred
Disconnect all cables (such as power cord and USB cable), wait about 20 seconds, and
reconnect the cables. If the problem persists, visit the HP Web site (

www.hp.com/

support

) for the latest troubleshooting information, or product fixes and updates.