Samsung UE55BU8000K E-Manual page 250

If it does not turn on, make sure the power cable is properly connected to the device and to the wall outlet.
Check the connection of the HDMI cable to your TV or One Connect Box.
Also make sure that the correct source is selected on the
Sources).
HDMI
Connected Devices
One Invisible Connection
/One Connect Cable
HDMI
One Invisible Connection
/One Connect Cable
Connected Devices
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HDMI
( Menu Connected Devices