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Long repeating alarm at power on

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I have been having overheating issues on my Stock Ender 3, so I took apart my head and changed my nozzle. I also removed and inspected the heater and thermistor. Nothing looked amiss, so I reassembled everything and turned it on…

And I was greeted with a long, ear-piercing alarm. I never unplugged anything, so I didn’t reassemble it incorrectly. I tried flashing the firmware, but I still get the alarm. 

Did I kill my board?