Here are the steps to cross-reference to take to fix a printer that is showing offline:

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1. Turn the printer off and back on.
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2. Check that the printer is connected to the same network as the computer.
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3. Check the network properties to make sure the printer is not set as a static IP address.
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4. Run the Windows Printer Troubleshooter.
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5. Check other computers to make sure the printer is online.
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6. Set the printer as the default printer.
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7. Check the printer port and delete any unnecessary ports.
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8. Update the drivers for the printer.