why not post in P6 section?
P6 has two app buzz5 and buzz6.
for buzz6 while in the app press menu, settings, configuration, other settings, and change stat live tv on boot to ON.
for buzz5 while in the app press menu, settings, configurations, toggle on where it says start live tv on boot.
make sure you are using the HDMI cable that came with it. if yes. then reseat cable on both ends and also try a different hdmi port on your tv if possible.