The store I currently work for needed a printer for a single computer in the back. The owner brought a bunch down from the attic that were part of an old network the store once had. He said there was nothing wrong with them when he put them up there, but every one I tried left darkened the whole page and left streaks in places. I called the company and the customer service guy had me clean the drum (round thing on the cartridge) and the glass part in the printer itself. This didn't help. Before I take them in is there anything else I can try? The printer model is a Brother HL-1440 Laser Printer.