Summary: My ML3051ND came with a defective cartridge, producing white drop-outs across all pages. After four months, a dozen calls, and several faxes, Samsung support operators have been unable to transfer my problem to a decision-making level, let alone fix the machine. Their operators have admitted to being overwhelmed. I finally bought a new cartridge, which cured the problem. But even now, Samsung can't find anyone who can authorize a reimbursement.