HP9800 Print Driver

This is driving me nuts!

I can connect my HP9800 printer using USB and the iMac automatically identifies it and inserts Business Inkjet 2.8 in the 'print using' box and all goes well.

If I connect via my print server the iMac does not identify the printer by type, but it never has done. I always have to pick the correct printer driver from the drop down list. However, the Business Inkjet 2.8, or HP Deskjet 9800 is not listed.

So the Mac has the correct driver on it and will find it automatically if it can identify the printer type, if it can't I cannot select it manually. Any ideas how to get over it?

Thanks