Print not centering

Mac is G4 mirror front runing OS X 10.4.11

Printer is Epson Stylus Colour 860.

Problem is can't get print centred on page.

Regedless of which publishing application I use. Either Photoshop CS2 9.0 or QuarkXPress I can't seem to get the print to centre.

ie. With Photoshop the document size is A4 landscape with 17mm white border all around.
Page Setup shows A4 papersize, Scale 100%

However in the print dialog box the preview shows the image to be off centre and prints off centre by 5mm.

This happens with portrait prints also. The image moves to the left on landscape prints and moves up on portrait print.

Same with Quark. In the preview regardless of which page positioning I use, it shows in the preview that the page is not centered.

Am I missing something?