HP Laserjet 6P problem

I recently reinstalled an HP Laserjet 6P on a Win2k machine and when I print more than one page the printer puts every page in the spool on one sheet, one page on top of the other.

Printing just one page works fine. The printer is shared on a LAN through a workstation, and all attempts to reinstall drivers does not work.

Do I need to send the printer in for repairs? Or is it another issue?