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are you using an HDMI cable? is it a cheap thin cable or heavy duty?
HDMI cables carry sound but it's possible you don't have it seated completely or it's a cheap cable. or your audio settings on your TV are not set to HDMI if that's the cable you're using. try running your audio setup on the TV Menu.
If it was transported likely the set was damaged--one of the three picture tubes used could have been damaged--the flashing light is the set trying to come on and the buzzing is related to whatever is bad.
It is rare in this set but it indicates a short somewhere that is pulling voltage inside the set down---not a do it yourself repair unless you are a Technician with some basic equipment and a schematic diagram.
Same problem. Replaced both convergence ICs about 5 months ago. Worked fince since then and just recently no sound, no video, blinking red on front panel and clicking sound. I suspect that the ICs went bad again and blew a resistor or two. I used cheap Chinese ICs instead of the Sanyo ones and thing this is why. I'll be looking at it again and post solution.