HP Officejet J5740 All-in-One Printer - Manual (Page 127)

Communication problems over a USB connection
If the HP All-in-One and computer are not communicating with each other, try the
following:
• 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.
• Check the USB cable. If you are using an older cable, it might not be working properly.
Try connecting it to another product to see if the USB cable works. If you experience
problems, the USB cable might need to be replaced. Also verify that the cable does
not exceed 3 meters (9.8 feet) in length.
• Make sure your computer USB ports are enabled. Check the documentation that
came with your operating system for more information.
• Check the connection from the HP All-in-One to your computer. Verify that the USB
cable is securely plugged into the USB port on the back of the HP All-in-One. Make
sure the other end of the USB cable is plugged into a USB port on your computer.
After the cable is connected properly, turn the HP All-in-One off and then on again.
• If you are connecting the HP All-in-One through a USB hub, make sure the hub is
turned on. If the hub is on, try connecting directly to your computer.
• Check other printers or scanners. You might need to disconnect older products from
your computer.
• Try connecting the USB cable to another USB port on your computer. After you check
the connections, try restarting your computer. Turn the HP All-in-One off and then on
again.
For more information on setting up the HP All-in-One and connecting it to your computer,
see the Setup Poster that came with the HP All-in-One.
Troubleshooting tips 125