I have a Brother MFC-440CN printer/fax/copier. It had a paper jam recently and now is having problems printing. I cleared the jam; it then printed a couple of pages, then gave me an "Unable to Print 4F" message. I was able to unplug the printer a few times and it then printed one page, but the same message then reappeared. It will now not even print one page no matter what I do. It will not execute the "clean" command either. Any help would be greatly appreciated.