More information would be helpful. How is the printer connected? Via LPT, or network? If LPT, have you verified the functionality of the cable. If network, have you verified functionality of all RJ-45 cables, as they are all patch to your router or punch down block? Have you given the printer an IP address? Can you ping the IP address? Is the subnet set up correctly for your network? You're NOT using DHCP for IP configuration to the printer? Any error messages you recieve on the product or computer? Have you verified functionality of the Printer by running a config page? If you are connecting via the network, does your printer have a Jet Direct 615N as these have known problems with HP, and may be the cause, to which they will replace it at no charge. Let's see, what else did I miss.
It would be very hard to even make a wild guess as to why you are having this problem with out having more information first.
Timothy N. Couch
A1 Printech
Anchorage, AK