A:
1. disconnect power
2. pull paper out of paper tray - look inside with flashlight to ensure all debris is gone
3. turn printer upside down and check for debris again - use flashlight
4. reconnect power supply
5. print
Please see this tutorial <http://www8.hp.com/h20621/video-gallery/us/en/customer-care/2870676173001/fixing-a-paper-jam---hp-deskjet-2540-all-in-one-printer/video/>