HP Photosmart C4390 User Guide - Page 150
Power and connection messages, HP All-in-One not found, Communication test failed
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Troubleshooting Power and connection messages The following is a list of power- and connection-related error messages: • HP All-in-One not found • Communication test failed • Improper shutdown • Two-way communication lost HP All-in-One not found Cause: This error applies only to USB-connected devices. 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. For more information, see: "Communication problems over a USB connection" on page 91 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. Errors 149