Corrupt UI when turning printer on with Octoprint connected

What is the problem?

The UI on my Ender 3 v2 is showing as corrupted whenever I turn the printer on with my Octopi already connected. No loading bar is shown when the printer is turned on, and the display doesn't seem to update unless I try to navigate around the menu. When I do, many of the options are shown as corrupted icons.

Another thing I am seeing is that when the printer is turned off at the PSU, having Octopi connected will result in either the printer display flashing on and off (black screen powered / not powered), or one of the hotend fans will repeatedly try to spin.

None of these issues occur if I connect Octopi after the printer has been turned on.

What did you already try to solve it?

  • Reinstalling / reflashing Octopi
  • Installing latest Marlin firmware on Ender 3 v2
  • Use different power supplies for the Raspberry Pi
  • Use different cables for the Pi -> printer connection

Have you tried running in safe mode?


Did running in safe mode solve the problem?


Systeminfo Bundle (26.2 KB)

Hello @Apologin !

It seems that the printer is in some unconditional state due to backpowering before powering the printer.

You may try this:

In fact, it's more an issue with the printer than with OctoPrint

It looks like that was the issue. Thanks for your help!

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