My Brother printer displays 'Printer in Error State' after a power outage. What should I do?

A power outage can sometimes corrupt the printer's internal memory. Try resetting the printer by unplugging it from the power outlet for 60 seconds, then plugging it back in. If that doesn't work, try a factory reset (refer to your printer's manual for instructions – be aware this will erase custom settings). As a last resort, consider updating the printer's firmware.