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The receiver's out put sections are grouped in pairs. Front left and right in one output, rear left and right in second output, and center channel and sub output on the third. Sounds like a semiconductor or semiconductors have gone bad in the center & sub output.
Blinking indicates that the power source has shut itself down because another component has died and it's shorting it. Unless you have experience in electronics it's time to take the receiver to a repair shop.
Maybe the surround processor is having a bad day... My kenwood would do similar and a reset was necessary to correct. Have you tried resetting the system? On my Sony STR DE 597 this is accomplished by powering off. Then while holding the 2 channel button down (front face plate) power on. A reset message is displayed. Your model may be similar but check your manual or download the PDF of the manual from Sony's support website. Hope this helps
make sure that all input cables are in the correct positon also make sure that any inputs you are using don't have a macrovision in them that will also kill your sound due to copyright laws and stuff but main thing check all wires coming in to receiver and if you need more inputs go to walmart and get a rca splitter basicaly its a 1 in two out connection to add more cables in the input