If it clicks twice almost instantly (on then off within 1/2second) then its got a serious power supply imbalance.
If it clicks on then 5secs later clicks off then one of the amplifier channels has probably failed and the protection circuit is tripping it off to protect itself.
either way its a repair shop job I'm afraid
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http://www.retrevo.com/support/Yamaha-RX-V596-Receivers-manual/id/320ag000/t/2/
Register and download the setting guide for free at hifiengine.com
http://service.us.panasonic.com/OPERMANPDF/SCBT230%20EZ%20SET%20UP.PDF
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