I assume the blank spaces run horizontal, as in the same direction as the carriage. Which means you have a media advance issue. Are they printing in...
I am fairly certain you can not put a used hard drive in another machine and expect it to work. Once the drive is serialized to a printer it can not...
Yikes. If I had to guess, the belt is either not installed at the back of the carriage correctly, or the back of the carriage is broken and allowing...