Hi there, Lisa here to help. What printer do you have? I'd like to offer you a document you can use to troubleshoot paper jams, but it is best if I know which printer model you have. You can use the following link to find your product number if you are unsure:
Finding Your HP Product Model Number
In the meantime, let's perform a hard reset. To do so, leave the printer on and unplug the power cable for 1 minute. While it is unplugged, hold down the power button on the printer for 10-15 seconds to release any built up power, then after the minute has passed, plug the printer back in.
You can use the HP website to search your product and locate the necessary troubleshooting steps yourself if you'd like, or use the comments option to respond back to my reply and I will search for the necessary document for you:
HP Troubleshooting.
I hope this helps, and look forward to hearing back from you if you require further assistance.
Thanks, I work on behalf of HP.