Hi Myself Sam Diesel, There are several reasons why a Brother printer may be offline. To troubleshoot this issue, your brother can check the printer's connection, ensure that it is turned on, check the ink and paper levels, and make sure that the printer driver is up-to-date and properly installed. He should also check the printer's settings and ensure that it is set as the default printer. If the issue persists, you can refer to the printer's manual for more detailed troubleshooting steps or contact Brother customer support.