I have a HP LaserJet 4050n. The problem is that since a few days it suddenly started printing empty pages. A day or two before, I fixed the paper tray unit, but after that I could print a correct test page.
The cartidge was empty, so I replaced it with a new one, but it does not solve the problem. It prints blank pages when I try to print the configuration page, too. I cannot figure out why it stopped working, because the power contacts to the cartidge look okay to me. The drum looks very clean and it turns, which I verified using a felt tip marker.
Any help/hints how to solve the problem? I think it might be some problem with the high voltage but I'm not sure. Is there some special fuse for high voltage which might have melted and can the printer detect these things?