Raspberry Pi
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FAQ
No signal on HDMI
Could be your image is broken, try booting a raspbian image.
Identify your pi
cat /proc/device-tree/model
Read CPU temperature
/usr/bin/vcgencmd measure_temp
Could be your image is broken, try booting a raspbian image.
cat /proc/device-tree/model
/usr/bin/vcgencmd measure_temp