I'm a new user of AutoCAD LT 2007, which I use with Windows XP (Media Center) on an HP, with an HP officejet series 5600 printer.
I created a drawing in model over a couple of hours, printed (plotted) once when the drawing was still unfinished, and saved subsequently. When I'd finished the drawing, I tried plotting again and it only printed some of the work--the lines I had made early in the drawing were printed, but the print (and preview) included a few I'd made after the first plot.
I tried changing the printing settings, checked the background, and tried creating a new file by copying and pasting the work--but the previews/printouts remained the same. I haven't found (so far) any other messages on the board that have helped. I'm sorry if this is a common or easily-solved problem, and thanks,