Before this driver version I was having similar problems (ie - multiple blank pages with just a little bit printed on each of them).
I downloaded this on both an iBook G4 12" 1.33 GHz and a G5 2GHz dual processor and both seem to be working fine. Both computers are running OS version 10.4.8
Thanks!
HP PSC 2100 series
printer/scanner/copier
Version: 7.9