My Brother printer is stuck in an error state and won't respond to button presses. What can I do?

If the printer is completely unresponsive, try a hard reset. Unplug the printer from the power outlet. Press and hold the power button for 30 seconds while it's unplugged. Then, plug it back in and turn it on. This can sometimes discharge any residual electricity and reset the printer's internal state. If this fails, it may indicate a more serious hardware issue.