Onkyo TX-NR515 no sound from amp

Hi this is Rahul here , 
I am using Onkyo tx nr515 from last 8 yrs . 
Recently I have found that no sound coming. I have checked all connections and tv settings. 
Also I have noticed that, before “ Click” noise used to come while changing the channels e.g from BD/DVD to GAME or TV . 
That particular Click noise also not coming. 
Could you please help me to resolve this issue. 
Thanks