I'm printing on an Apple LaserWriter NTR from Mac OS X 10.4.11, using a HP jetdirect printserver and the parallel port.
When printing from Mac OS X, printouts are shifted roughly 1,5 cm to the top, means that I lose the first 1,5 cm of my page and have a broader margin at the bottom.
I checked the printer with Local Talk and Mac OS 7 - that works fine, and the internal test page has proper margins as well, so I guess this is not a hardware issue.
I tried several options with modifying the margins in the "Page setup" dialog - but didnt really find the clou.