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Disconnect all speaker cables, and other connections from the (I assume Yamaha) AVR. Then try turning it on. There may be a short in the speaker connections due to a strand of wire, bad speaker wire, bad speaker, etc.
With nothing connected to the AVR see if it works and start adding stuff back one cable at a time if it works. Be sure to turn the AVR (and other devices) off while making connections, then turn them on once the connection is made. Also, try a factory reset - there's usually a sequence of button presses in the operating manual outlining a reset.
If the AVR won't stay on with nothing connected, you have a problem internal to the AVR.
With nothing connected to the AVR see if it works and start adding stuff back one cable at a time if it works. Be sure to turn the AVR (and other devices) off while making connections, then turn them on once the connection is made. Also, try a factory reset - there's usually a sequence of button presses in the operating manual outlining a reset.
If the AVR won't stay on with nothing connected, you have a problem internal to the AVR.
