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6. Turn the printer off, and then disconnect the USB cable and power cord.
7. Quit any antivirus programs or other software programs that are running on the
computer.
Note To quit an antivirus program, follow the manufacturer’s instructions.
8. Reinstall the printer software:
a. Insert the printer software CD into the drive.
b. Follow the onscreen instructions. When the installation program prompts you,
connect the USB cable and the power cord to the printer, and then make sure
that the printer is on.
Note Do not connect the USB cable until you are told to do so.
c. Follow the onscreen instructions to finish the installation.
9. Restart the antivirus program.
"Unknown Device" message displays
During installation, an “Unknown Device” message might be displayed when you connect
a USB cable between the printer and the computer. A possible cause might be a defective
USB cable.
Note This is not a problem if you are using Windows 2000. If you are using
Windows 2000 and this message is displayed, you can continue with the software
installation.
To resolve the problem
1. Disconnect the USB cable from the printer.
2. Disconnect the power cord from the printer.
3. Wait approximately 30 seconds.
4. Reconnect the power cord to the printer.
5. Reconnect the USB cable to the printer.
6. If the “Unknown Device” message is still displayed, replace the USB cable.
Chapter 12
68 HP Deskjet D4100 series