Had a paper jam. Removed paper jam. Now, when a page is printed, it comes out with what the manual calls 'staining' meaning that the entire background of the printed page is grey.....bands of grey maybe 3 inches long and the width of the page. Do I need to buy a new ink cartridge? It used to print fine before the paper jam. Did I damage something when I removed the paper jam?......Did I damage the drum? H E L P....please... --HP LaserJet 4L Printer