Hi, toto and tanle.
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The following link will provide you with some information that might help you to find a solution for this issue. We also recommend you to run the Setup Assistant process once again in order to verify if the settings are properly set.
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I was having the same problem. Video was streaming, but no audio. All wires were connected (cannot remember how many times I questioned my sanity by checking over and over again, replugging something that was already plugged in).
My SOLUTION: I took the power out of my cable box and plugged it back in and then just to make extra sure, I rebooted my Slingbox Solo. The cable box reboots and so does the Slingbox and it appears to have worked. I am using Firefox....
Lesson to us all (well at least for me): If something doesn't work, turn it off and on again.....