Samsung PN51E6500EFXZA - Manual (Page 611)

because the cable or satellite box is not
outputting a signal. To test the signal
output of your cable or satellite box,
press the guide or info button on the
cable or satellite box remote control. If
the screen displays the guide or info
data, the problem is caused by the box.
Stand Assembly
If you have any trouble assembling the
stand first, review "Install the Stand" in
the paper manual.