Troubleshooting: Dell™ USB Enhanced Multimedia Keyboard User's Guide
My keyboard does not work.
The keyboard cable connector is not inserted correctly.
Please check the keyboard cable connector to ensure that the connector is plugged correctly into the USB port of the computer.
My keyboard's USB Hub does not work.
The connection device is not a low-power or self-powered USB device. The connection device is not compatible with USB Full-speed device Specification.
NOTE: Some of USB High-speed devices cannot workable on USB Full-speed Hub ports.