Clear any loose paper from the paper tray. This will help you locate the jam. You will find it either in front, near the paper tray, or in the back, by opening the rear door.
Be sure there is no paper or debris hidden anywhere. Open up the rear door and use a flashlight to explore the inside. If you see any paper, have patience in trying to remove it, now gently pull using a side to side motion. If you use a tool for assistance, like a pair of tweezers, or pair of needle nose pliers, put some tape on the jaws of the pliers to help prevent the shredding of the paper.
Another good item to have handy is canned air. This can be used to blow out any built up dust or fine paper particles that may be embedded inside the printer and the sensors after much use.
Reboot your computer
Here is a HP link that may also help you