Below is a demonstration of how to fix the Brother Printer Offline Mac problem. Make sure your printer is powered on and on. Ensure the loading tray has sufficient paper. Remove any paper clogs you may across. Check to see if your printer is having any new problems. Your Brother printer should be able to join a wireless network. Make sure your computer can detect the printer and that the USB discs are properly inserted into the USB ports. Additionally, get rid of the printing queue that is full. Make sure your Brother printer's firmware is current.