When a printer is offline, it is because the computer is not recognized at the time.
This may be because your beam placed configuring the printer offline, or has been disconnected from the USB cable.
Although not disconnect the USB cable and you have not done anything to take the printer offline, it is possible that the USB cable does not work correctly, is when you look at replacing it with another.
This is all I have to say, look at the USB cable, check the printer settings (in your printing devices) and could be the USB cable have problems or port.
I'll be around any other questions...
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