hp officejet pro 6978. Was working this morning. I moved it and the plug came out of the back. I plugged it back in and it gave me an error message that it was shut down wrong. Then it said to unjam the paper (nothing jammed), then it says there is a problem with the printer or print system. Tur the printer off, then on. (i did, several times) If you continue to get this message, contact HP.
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