No audio. After years of using my onkyo receiver with no problems one day I turned it on and I got

Question

After years of using my onkyo receiver with no problems one day I turned it on and I got no audio.... I was afraid I disconnected something but nothing was wrong with my setup because I switched everything to my Sony receiver and everything sounds perfect.... I would like to get this receiver working again and I was told it might be a fuse..... but I only have found one fuse in the entire board and that fuse is fine...... Just for more information, everything seems like it is working fine it is just silent no static no feedback nothing.