Bonjour à tous hazard avez vous essayé d ajouter cette ligne dans /boot/config.txt
hdmi_force_hotplug=1
Pour recalbox 4 ne pas oublier de mettre la partition en écriture : https://github.com/recalbox/recalbox-os/wiki/partition-en-ecriture-(FR)
HDMI_FORCE_HOTPLUG Setting this to 1 pretends that the HDMI hotplug signal is asserted, so it appears that a HDMI display is attached. In other words, HDMI output mode will be used, even if no HDMI monitor is detected. HDMI_IGNORE_HOTPLUG Setting this to 1 pretends that the HDMI hotplug signal is not asserted, so it appears that a HDMI display is not attached. In other words, composite output mode will be used, even if an HDMI monitor is detected.