Samsung ES6710 Series E-Manual page 748

The connected device is not displayed.
Check whether or not the device
supports Anynet+ functions.
Check whether or not the HDMI cable is
properly connected.
Check whether Anynet+ (HDMI-CEC) is
→ →
set to On. (Menu System Anynet+
(HDMI-CEC))
Search Anynet+ devices again.
Anynet+ requires an HDMI connection.
Make sure the device is connected to