"Checked the fuses" means different things to different people. For some, it means LOOKING at the fuse. For others, it means removing the fuse and measuring the fuse with a multi-meter of some type. If you have not used a multi-meter to check the fuses, you really have not checked the fuses. Also, assuming your AVR has an IEC connector for the power-cord, there is a fuse built-in to many IEC sockets. It typically has to be popped-open with a small screwdriver and it usually then "slides out" like a tiny drawer. Sometimes those fuse holders include a second spare fuse, other times, there is a hole for a second spare fuse, but no spare fuse is installed. You have not mentioned whether there is ANY response from the AVR when you turn it on. Are there front panel displays? Do any displays on the front panel change when you turn on the power? Have you tried a different power cord? Are you CERTAIN there are no bare wires on the ends of your speaker cables that are shorting across any 2 speaker cable terminals... either on the AVR or on the speakers themselves? Even 1 stray wire touching a binding post it shouldn't be touching will cause HUGE problems. Also, try a different AC power outlet just in case the problem is not the AVR. You might have loose connections at the AC outlet that compromise the power delivered to the socket.