If the standby LED light is on but the set won’t turn on, then it may be question of power cord not correctly engaged in the socket. Try to take out and re-insert the multi-pin socket behind both the recorder and the main woofer. That solved the problem for me.
Interestingly I also had the same problem with my Panasonic home theatre system and was checking this very site for solutions. I chanced to look into another user query on the same lines and the solution given by the expert set me thinking that when the standby power is on, it may not...