The Yamaha is going into protection mode (a HARDWARE failure). First disconnect all (speaker) wires and all (other) connections. Then disconnect the receiver power for 30 minutes. With everything still disconnected try powering it back up.
If it powers up and doesn't go into protection mode the issue may be caused by one of the connections (most likely, the speaker wires). Make sure there is no stray wire shorting across the terminals. Also, for the length of the wire, confirm that the insulation is intact.
If it still goes into protection mode then the issue is with an internal fault and you'll need to have it serviced by a technician. Considering the cost quoted, try someone else or (my vote) you might as well put the money towards a new receiver.