Got the Arduino IDE installed on a working Raspberry pi 3A+, then put on the QWIIC Hat and connected a sensor (UV spectrometry). LED of the sensor lit a couple times, then the Pi crashed.
Tried to restart, not working, then formatted the SD card, re-installed the Ubuntu with nothing else and still the Rapsberry pi not booting (just a blue initial screen, then nothing)
What can be done?