If my OSMC Pi boots without display switched on, when I switch it on I get no output

try adding the following lines in config.txt

hdmi_group=1
hdmi_mode=16
hdmi_force_hotplug=1
hdmi_edid_file=1

hdmi_mode=16 will set your screen to 1080p 60hz. If your tv is different check the number code in

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