When I first hooked up my Sonos Arc with x900F, I was able to see the splash screen via HDMI3 (ARC port). After updating my x900f to the new OS, the splashscreen no longer shows up when I switch to HDMI3 - it is now showing no signal screen (default).
Sound is still working but not sure if this is normal.
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Try unplugging the Arc from power for a minute or two.
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