To resolve HP printer offline errors, start by checking the printer's connection and ensuring it is properly connected to the network. To reestablish the connection, restart the computer and printer. Verify the printer's default status in the Control Panel and set it as the default printer. Update or reinstall the printer drivers to ensure compatibility. Use the HP Print and Scan Doctor tool to identify and address common issues. If the problem persists, manually set the printer online through the Control Panel.
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