My toshiba model 50L1350 has power but no sound and a black screen. What I could be the problem?

[matisoria20]

I turn my tv on and the green light is on but there is no sound and the screen is black

 

[matisoria20]

MERGED QUESTION
Question from matisoria20 : "Television not working"

My toshiba 50L1350u turns on but has no sound and screen is black. What could the problem be?