How is your printer attached to the network? Are you using a print server built into a router? Are you sharing this printer from another system? Etc..
Give us some more info on the topology and then we can take some basic troubleshooting.
This reminds me of an USAF complaint that I once read:
Problem: "Number three engine missing."
Solution: "Engine found on right wing after brief search."
Details in your problem description will help us give you the right answer and not give you one of those