HP Photosmart C4270 All-in-One Printer - Manual (Page 134)

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.
For more information, see:
“Communication problems over a USB connection” on page 79
Communication test failed
Cause: The HP All-in-One is turned off.
Solution: Look at the On button located on the top of the HP All-in-One. If it 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 On button to turn on the
HP All-in-One.
Cause: The HP All-in-One is not connected to the computer.
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.
Errors 131
Trou
bles
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ing