Upstate NY is just the cold weather version of the Bible Belt.

I’ll do that. Should I be using the “Ender-3 4.2.2 mainboard (32bit)” firmware? I’ve read that the Marlin firmware isn’t compatible with the GD CPUs, so I’m assuming the “Ender-3Marlin2.0.6HW4.2.2GD” won’t work.

Update: support got back to me, with instructions to reflash using the latter firmware. The symptoms changed: during the firmware “upgrade”, the 05 LED flashes about once a second. I let it run for ten minutes, but the printer never rebooted. Powered it off, removed the SD card, powered it back on… Still nothing but a blue display, though the 05 LED keeps blinking once a second.

I’m thinking it’s a bad motherboard. Waiting on support, now.

I’ve got a laptop running Linux on it; connected it up at some point during my time with it. The laptop was able to see the USB to serial adapter, but I didn’t poke at it to see if anything was talking on the other side. I’ll try that today!

Checked for that, too. Both the original panel and the replacement only have one “port” for the cable on the back. The board has spots for two more to be connected, but both are missing. Looking at the front of the panel (as if I’m using it), the port is the left most of the three.

Add sardines to that, and you’ll have reached a whole new level.