HP J5780 User Guide - Macintosh - Page 261
Improper shutdown, Two-way communication lost
UPC - 882780940253
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Solution: If the HP All-in-One is not properly connected to the computer, communication errors can occur. Make sure the USB cable is securely connected to the HP All-in-One and the computer, as shown below. Improper shutdown Cause: The last time the HP All-in-One was used, it was not turned off properly. If the HP All-in-One is turned off by turning off the switch on a power strip or by using a wall switch, the device can be damaged. Solution: Press the Power button located on the control panel of the HP All-in-One to turn the device on and off. Two-way communication lost Cause: The HP All-in-One is turned off. Solution: Look at the display on the HP All-in-One. If the display is blank and the Power button is not lit, the HP All-in-One is turned off. Make sure the power cord is firmly connected to the HP All-in-One and plugged into a power outlet. Press the Power button to turn on the HP All-in-One. Cause: The HP All-in-One is not connected to the computer. Errors 259