Is the parallel or USB cable working and connected correctly?
The parallel or USB cable might be defective. Try the following:
Disconnect the parallel or USB cable at both ends and reconnect it.
Try printing a job that has printed in the past.
Try using a different IEEE 1284-B-compliant parallel cable or USB cable. See
HP parts and accessories
Contact the manufacturer of your computer about changing parallel port settings to an ECP
(extended capabilities port).