HP Deskjet F2100 User Guide - Page 124
Communication test failed, button to turn on
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Troubleshooting Chapter 12 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 Communication test failed Cause: The HP All-in-One is turned off. Solution: Look at the On light located on the front 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 computer is not communicating with the HP All-in-One. Solution: If the HP All-in-One is not properly connected to the computer, communication errors can occur. Make sure the USB cable is connected to the HP Allin-One and the computer as shown below. 122 Troubleshooting