Print job "completes" but remains in the queue without every printing.

My HP Officejet Pro 8600 printer won't print. The print job "completes" but remains in the print queue. I've tried all the basic solutions, but nothing works. I know the printer is connected to my network as my two Window 7 PC's print to it just fine. Everything is connected through a Netgear R6300 router. I've tried to reinstall the printer driver on the Mac from the HP installed CD, but it fails to complete the job. I get "an error occurred while trying to add the selected device"...."unable to communicate with the printer at this time" message. Any suggestions?