HP Deskjet 990cxi Printer - Manual (Page 55)

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Problems?: Troubleshooting Tips
When I connect a USB
cable between the printer and
my computer, an “Unknown
device” message appears.
• Static electricity has built up in
the cable between your
computer and printer.
OR
• You may have a defective USB
cable.
1 Disconnect the USB cable from your printer.
2 Unplug the printer from its power cable.
3 Wait approximately 30 seconds.
4 Plug the power back into the printer.
5 Plug the USB cable back into the printer.
6 If “Unknown device” continues to appear in the “New hardware found”
dialog box, replace the USB cable or use a parallel cable.
The printer software won’t install, what’s wrong? Continued
What is the problem? Possible cause To solve the problem…