Hi,
Here are two options which may resolve your problem.
1. Check that the adf cover hinges are not loose. Just wiggle the hinges back into place and check that the cover sits properly (there is a hole in the left of the glass copier into which a place knob must sit).
2. Perform a Hard Reset:
Unplug the power cord from the printer and wall
Take out the toner/cartridges
Wait 30 sec
Plug the power cord back into the printer and wall (Make sure the printer is plugged into the wall and not a surge protector)
Insert the toner/cartridges back into the printer