Lets perform a hard reset on the printer. Follow the steps below:
1) Make sure the printer is powered on.
2) With the product turned on , disconnect the power cord from the rear of the product.
3) Unplug the power cord from the wall outlet.
4) Wait for 30 seconds and connect the power cord back.
5) If the product does not turn on by itself, press the power button to turn it on.
Also, try the steps to clean the rollers in the following document:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01963794
Let me know how this goes.