Network printing MAC

We have a Power Mac G4 used for graphics and printing to a network printer. We had no problem printing for the last two years. Now it will not print to the network printer (windows 2K network). I printed from the Win2k print server with no problem. I can bring up all the network printers on the MAC and I can ping the MAC through the network. When I go to print, the icon on the screen shows a picture of a document, then goes away after a few seconds, but it does not print to the HP laserJet 1200.