Solution: Check that the HP All-in-One is turned on, and then try the usb connection again.

To retry the usb connection

1.Unplug the HP All-in-One power cord, and then plug it in again.

2.Verify that the USB cable and power cord are plugged in.

3.Click Retry to retry the connection. If this does not work, continue to the next step.

4.Verify that the USB cable is set up properly as follows:

Unplug the USB cable and plug it in again or try plugging the USB cable into a different USB port.

Do not attach the USB cable to a keyboard.

Verify that the USB cable is 3 meters (9.8 feet) or less in length.

If you have several USB devices attached to your computer, you might want to unplug the other devices during the installation.

5.Continue with the installation and restart the computer when prompted.

For more information, see:

Uninstall and reinstall the software” on page 106

Troubleshooting

I received a message that an unknown error has occurred

Cause: The source of the error is unknown.

Solution: Try to continue with the installation. If that does not work, stop and then restart the installation, and follow the directions on the screen. If an error occurs, you might need to uninstall and then reinstall the software. Do not simply delete the HP All- in-One application files from your computer. Make sure to remove them properly using the uninstall utility provided when you installed the software that came with the HP All- in-One.

For more information, see:

Uninstall and reinstall the software” on page 106

Software installation troubleshooting

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HP C4390, C4380, C4385 manual To retry the usb connection, Received a message that an unknown error has occurred