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@mdlefevere
Could this be a Pi4 related issue?, or just Samsung?.
or HDMI cable?
@sdetweil
Weird. I switched back to a Pi3 and it’s working fine now. Connected it with a HDMI<>HDMI cable to the HDMI Arc port on the TV. The TV instantly popped up with a CEC connected Raspberry.
Left it for over a night and just now it perfectly started.