I'm having same beeping issue on power up. I completed a long print over night, and turned printer off in the morning. Later that afternoon I turned the printer on and it started beeping. I've checked all the cables to no avail. Screen is black and beeping is non-stop. I've disconnected bltouch to see if that helps. It didn't. @curious aardvark mentioned that there is a reset button on the board. I have the 4.2.2 board and I don't see anything. Can someone point me to where/how to reset (I know how to flash eprom).