I have been getting the following errors when turning on the printer:

55:11 Line Sensor is out of Life. 21:13 Check maintenance cartridge path

To be sure, I replaced the maintenance cartridge properly and checked with a flashlight for any bits of vinyl or other foreign bodies that might be obstructing. I see nothing but a clean and empty space with clean "rails". These errors are not only preventing me from printing, but they prevent me from even getting into any menus. So, my 3-month-old HP is useless at the moment. Please help!

Change the line sensor; had the same 55:11 code at a customer. The Problem was that the pins of his line sensor began to rust because of humidity.

Thanks, @bex for your comment. However, if the problem persists I suggest contacting your HP Support Service.

Thanks I am under warranty, so I called HP and they have a tech coming out to replace the sensor.