I have the HP Designjet 650C. From the front panel the test page prints fine. I installed the latest driver for the unit and attempted to print a test page through Windows XP from the printer properties page. I can tell that it is printing the Windows Print Test Page, but it is printing black ink over the top of everywhere where text appears on the test page. I can see the letters are being printed behind all the black ink. I get this same result when I tried to print a document created in Windows Publisher (document printing but covered in black ink). Not sure what to do. Any help appreciated.