Hello Everyone.
I understand your concerns as this situation seems frustrating. Please verify what type of printer you have. Click here to find out: Model Number.
How is this printer connected? Wireless or USB.
What type of program are you printing from? Does this issue occur using one program or multiple programs?
Please reference this HP document on Continuous Pages of Strange Text. This document only refers if your printer is connected USB.
Once you verify this information I can assist you further.