I purchased a laser printer cartridge from Del quite some time ago. It has worked find until two weeks ago. Now the pages come out with faint or blank spot down the middle. I have taken the cartridge out and tapped it with the handle of a screw driver to loosen the toner. There is still plenty of toner left in the cartridge. It helps for a few copies and then the faintness come back. Any suggestions on how to loosen up the toner. bob gillis PS, does anyone know or remember who makes this printer.