If your Ender 3 Pro suddenly refuses to boot up, and instead shows you a blank screen, you might be worried that it’s dead. Luckily, if you bought your Ender in 2020, it’s probably not that bad.

Maybe you accidentally flashed the firmware

For me, the blank screen issue was caused by the firmware. I had flashed it without realising. The Ender doesn’t do much to let you know what is going on. The screen is blank, the main fan spins up as normal.

While troubleshooting, I checked that all of the cables were firmly installed in the correct slots. I had gotten a few successful prints out of the machine so I knew I hadn’t set anything up backwards.

How to temporarily brick your ender 3

I was messing about with micro SD cards and booted up the Ender with an SD card with Octopi on it.

The Ender instantly flashed it’s firmware with some .bin file on the SD card and promptly forgot it was a 3D printer.

Since the Ender V-2 has started shipping, the newer Ender 3 and Ender 3 Pro are shipping with a new, 32 bit motherboard. These newer models can flash their firmware via SD, which is something the original Ender 3 was not able to do.

It’s hard to spot when this has happened, since the Ender does not output any information to the display. We get a blank screen, and none of the controls do anything.

The dreaded blue screen of death – Ender style.

Easy fix for the blue screen of death

The fix is easy – simply download the Ender 3 Pro firmware, put this .bin file onto the root level of an SD card, put it into your Ender when it’s switched off, and then power it up.

The screen will remain blank for a few seconds but then will boot up as normal.

If you have one of these newer Ender 3’s, you won’t need to use an Arduino to flash the firmware. Your 32 bit board will let you flash the firmware from an SD card.

The firmware that worked for me was the

Ender-3 Pro_4.2.2_Firmware_Marlin2.0.1 - V1.0.1.bin

which I found here.

Hope that helped

It took some Googling to figure this out, so I thought I’d write it up and save someone some time. Let me know how you get on.

Happy printing.