Do you have a question about the HP Compaq NC4400 and is the answer not in the manual?
Connect a USB device using the USB port. The operating system will issue a sound to indicate detection.
Safely remove a USB device by using the Safely Remove Hardware icon in the notification area before disconnecting.
Some USB devices require additional support software, which is usually included with the device.
Enable or disable USB legacy support in Computer Setup to use USB devices during startup or in non-Windows applications.