No sound on TV with mini DVI to HDMI cable.  Macbook, white, 2008-9 13"

Picture is fine, mirroring turned on, using mini dvi converter into HDMI on a new Samsung flat screen.  Want to avoid using additional cable from earhone plug to RCA plug in TV.  Thanks

Thanks for the prompt reply;  it saved me going through 16,000 permutations for nought.  BTW, although it seemed to be working well yesterday, today the computer is failing to load new sites, etc. when the DIVI is plugged in, and proceeds fine when unplugged.  Also, when I plug in the DVI, the screen image on the computer and tv flickers between black and then blue screens before the image stabilizes.  My TV and internet are both on Comcast cable, if that makes a difference.  Thanks for you help;  I wish the folks who sold lme the cable knew as much.  Also, no one seemed to know that you have to turn on the "mirroring" function for it to work at all.

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