I have a HP OfficeJet 4500 G510g-m. Everything was working fine. All of a sudden, I get this message "Carriage jam. Open carriage door and remove jam" But, I can't see where there was any jam. I've opened, inspected and closed the doors in front and back. But, I see nothing wrong. Yet, I continue to get the same message. It won't let me print anything. How do I get this machine to work again?
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