Yamaha RX-V673 - No Signal HDMI Output & the red HDMI indication keep blinking

I am currently using Yamaha RX-V673. I have been using this machine for 6 months now and I am very happy with it. It deliveres fantastic sound!!! However, last night after i reached home and tried to watch TV (cable TV), unfortunately, I can only hear the sound but no video. The TV showing "NO SIGNAL" and I started to panic. Then I switched to other sources, PS3, Blue-Ray Player and it is still the same, No Signal. Then I noticed the HDMI output light indicator keep on blinking. Could someone really help me to solve this problem.
 
Have you tried checking that the HDMI's are pushed in properly at both ends from the TV to the amp & the other bits of kit? Mine came loose & i got no picture from just moving the amp slightly when giving it a clean.

Regards ..
 

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