Printing
I was having the exact same problem & had lost my user's manual (you can go on the Dymo.com website to download a replacement). The !!!!!!!!!! display means that there probably is a tape jam. Here's what the manual says:
*!!!!!!in the display indicates that the tape can not be transported
*Press any key to return to normal display
*Check if there is a tape jam. In that case, life out the cassette and carefully release jammed tape. Cut off excess tape and refit/replace the cassette
*If there is no tape jam replace the batteries
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