How to Override a Paper Jam Error on an HP Printer

First, clear the jam if there is one. This step should resolve problems most of the time. If your machine has multiple compartments feeding paper, check all of them. Be extremely careful when pulling out jammed paper not to damage the print mechanism. Consult your machine's manual to determine the best way to pull jammed paper. Also remove any loose paper from trays and document feeders. After the paper is removed, your machine may automatically continue printing; if it does not, you may have to push 'OK' or another selection, depending on the product.
Make sure your paper is correctly loaded and has no folds, tears, staples or paper clips. Also verify in your user manual that the type of paper you are using is supported by the machine.
If you still have an error, try cleaning the paper rollers. Make sure you power off the machine. Take a damp cloth and wipe any dust or dirt buildup.
Try a power reset. Turn off the machine and unplug it for at least 15 seconds. Then plug it back in and see if the problem is resolved.
On a small printer, make sure the carriage is able to move freely. Make sure your machine is on, and open the cover; the carriage should move on its own. Remove any paper or objects that might be obstructing its path.
After the problem appears to be resolved, print a self-test report. The method for doing this varies with each machine, so consult your user manual.
If you are still having difficulty, consult HP directly. You may need to have your printer serviced.