I have an HP 4350 printer. When sending a print job, it prints the first page and then jams on the pages after. The second sheet of paper is usually blank and can be removed from the top without opening the lid. The next sheet requires the toner cartridge to be removed and then the next jammed sheet can be removed where about two inches of the sheet has come through. The rollers have been changed on all trays and the sensor is not jammed. Any ideas on what the problem could be?