HP laserjet shows offline on server but is pingable

We have three HP Laserjet 9000n printers, in addition to others, networked on Server 2003 R2. The three printers are wired through a Linksys mini switch. All three printers have appropriate drivers installed and have over 6 million pages each, on them. No configuration changes have been made.

Last week, our "A" printer showed up as offline in the printer management console on our server but the printer itself shows ready on the user display. In addition, the printer is pingable and the configuration page is accessible through the browser; the configuration page shows the printer as ready, as well. We can print a configuration page from the printer itself but not send a test page from any network host or the server.

On Monday, our "B" printer spit the bit in this manner as well. The "C" printer is still working fine.

We have:

1. Uninstalled/reinstalled printer and drivers
2. Changed cables
3. Played musical ports on the switch
4. Changed out the NIC's on the printers
5. Changed network ports/IP
6. Restarted the spooler service
7. Started sacrificing small animals

Any suggestions would be welcome.

Thank you.