While this is a fairly old question, I am hopeful my answer may help others in the future - My label printer was working fine, I ran out of tape and put a new one in, but the new one wouldn’t print anything. It looked as if everything was working, but the tape wasn’t moving. I tried another role of tape - one that I knew had worked previously, but it was the same issue there, so I knew it wasn’t a faulty tape cartridge. I read online that sometimes these label printers can power on but not have enough juice in the batteries to push the printer tape through. I changed the label printer for a couple of hours and everything is now working.