HP Photosmart C4200 Full User Guide - Page 135
Improper shutdown, Two-way communication lost, The HP All-in-One is not connected to the computer.
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Chapter 13 For more information, see: "Communication problems over a USB connection" on page 79 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 On 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 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. Troubleshooting For more information, see: "Communication problems over a USB connection" on page 79 132 Troubleshooting