No sound from the TV when using HDMI cable, No sound from the TV when using HDMI cable

I recently purchased HDMI cable and adaptor, so that I can play downloads from my Macbook Air on my TV. There is only sound from the Macbook, not the TV - Do I need as separate cable for sound?

I've got the same issue: when I connect my Macbook Air (2011) to TV via HDMI cable there's no sound through the TV system, only from the Macbook Air. I used to use my older Macbook Pro with the same HDMI adapter and it worked just fine, but not with the Macbook Air it doesn't.
My software is up to date. I tried to select the TV as an output option in sound preferences, but it doesn't yield any results.
Rebooding multiple times doesn't help either.
Any suggestions on how to tackle this problem?
Thanks in advance.

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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including sound output andWi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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No sound from the TV when using HDMI cable, No sound from the TV when using HDMI cable

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