Ender 5 Pro not responsive screen blank

[VagabondElf]

Your fans and the LCD are powering up. That makes me suspect the mainboard. Also, this sounds a lot like a problem I had some time ago:

BSOD on Ender 5 Pro after shorting thermistor

Hi, folks. So, last week I’d had a bad nozzle clog. As I was removing the nozzle to clean it out, I loosened the heat break (Micro Swiss all-metal hotend). After cleaning up the nozzle and putting things back together, I wanted to make sure the heat break was solidly in the heater block. My understanding is that it should be tightened once more after the block is hot. So I duly heated everything up to 220 (what the instructions recommended for tightening the nozzle) and got in there with th…

I ended up replacing the mainboard.