HP6980 won't print except for test page

My HP Deskjet 6980 has developed a printing problem recently. When printing a Word document, it will print very faint text, or nothing at all. I've run the HP print and scan doctor and it indicates no problems, although printing a test page from that application produces text with very faint print. The Windows 7 printer troubleshooter also shows no problems.

The odd thing is that using the buttons on the front of the printer to print a test page will produce a page with normal black text. Thanks for any thoughts you might have.