Why does my HP Printer print blank pages

I have an HP Deskjet 890C connected to a network hub with 2 PCs. I can print from the primary PC but when I try to print from the other PC I get a partially printed document with lots of blank pages, every time. The primary PC has file /printer sharing enabled. The network sees the printer. The parallel port in the bios is configured to ECP/EPP for both PCs. This used to work just fine. Any Ideas please