HP Officejet J5740 All-in-One Printer - Manual (Page 251)

HP All-in-One not found
Cause: The USB cable is not plugged in properly.
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 249