Hissing sound when connecting with hdmi

Hello,
I've recently bought a new lcd tv (Sony Bravia) and I thought I'd try connecting my MacBook Air with a HDMI cable.
I bought an expensive cable (it was pretty much the only one I could find "there and then") and also bought a "mini displayport to hdmi" adaptor from Amazon (like the one advertised on the Apple store online). I also connected audio (with a standard RCA audio cable) from the out to my amplifier.
Technically, the connection works but there is a hissing sound (a high pitched continuous noise). When I disconnect one of the two cables (ie: HDMI or audio) the hissing sound goes away. And I've tried a different audio cable and the problem is the same.
I appreciate this may be a difficult one to troubleshoot remotely but any insight would be appreciated!
thanks
PS: Front Row looks fabulous on a big display!

One possibility is that you open your computer and the television channel first. To some TV, it's no use. Maybe you can first to open the computer until after the TV showing. HDMI generally doesn't support hot swap. BTW, you can also install a *[usb to hdmi adapter|http://www.espow.com/wholesale-usb-multi-display-adapter-for-computer-a dd-on-a-second-monitor.html]*. So, if it's not OK, you can use the dvi to hdmi converter.
Sometimes, this happens in DisplayPort that have HDMI or VGA. This is from the audio chip and high-frequency sound. en,,it was a hard struggle to get a hdmi life. In this condition, we can use a *[usb to hdmi dvi adapter|http://www.espow.com/wholesale-usb-multi-display-adapter-for-computer-a dd-on-a-second-monitor.html]* to make it.

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