New Ender 3 power supply turns on but the controller board does not I just got an Ender 3 a day or two ago and was really excited being that it was my first 3D printer.
I got to work putting it together with little issue. I go to turn it on and the power supply starts up just fine (the fan on, the internal light on) but the mainboard fan isn't running and the screen isn't turning on. I wait a few minutes thinking that it needed to boot up but nothing. I tried reconnecting the red and black power cables and still nothing.
I'm not set up for tearing the thing apart and checking every socket with a voltmeter or something. I've checked the voltage switch and have it set for 115 V for North America. I remember now that when I was moving the bed and it lurched (because the wheels were too tight) the screen might have lit up.
I'm worried that the board might be fried. I don't feel like taking this thing apart and sending it back.
I prefer to check basic power connections with multimeter. But indeed if you are not in an emergency, it would be better to send it back. The wires may come loose, I mean on the main board.