I’ve done a lot of electronics repair and my Brother MFC-9320CW was exhibiting the classic symptoms of a dead power supply — no lights (not even a carrier light for the Ethernet jack), no buzz, nada. This machine has a traditional rocker power switch, not a software controlled “soft switch”. So, I read several other “my printer won’t start” answers and pretty much dismissed all of them. Someone suggested to unplug, turn on the power switch (with the power disconnected), wait a minute, then connect power and turn on as normal. I told myself “that can’t possibly work,” but I’m here to say that it did. The only explanation I can fathom is that the power supply control circuits must have some logic that was reset by draining the supply of whatever residual charge it had. Live and learn!