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check HDMI cable set hdmi_safe=1 try set parameters hdmi_group and hdmi_mode for your display (watch next point) read this link


You need to force HDMI output in /boot/config.txt (earlier models defaulted to composite, the Pi4 does nothing). # uncomment if hdmi display is not detected and composite is being output hdmi_force_hotplug=1 This requires a default resolution to be set in raspi-config (at least on the Pi4 - earlier models defaulted to VGA resolution). It is also ...

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