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@jp5 said in Is the Configuration file on the SD drive:
bed heater turns on automatically.
Does that still happen when the SD card is removed?
Does the SD card still show it's contents in a computer?
Can you go through this guide and let us know what you find?
https://docs.duet3d.com/en/User_manual/Troubleshooting/Duet_wont_respond
As part of the troubleshooting you'll have to disconnected everything. At that point please capture some close up well lit photos of the board.