Hdmi to tv, HD4870, no sound?


I bought a DVI -> hdmi adapter (4870 has a dvi connector) to connect my pc to my tv via hdmi. Picture works fine but i get no sound. Do i need to buy another cable for sound or update drivers?

I've had "ATI technologies Inc. - Display - ATI Radeon HD 4800 Series" in my windows update under optional updates for a couple years, i haven't updated them because everything seems to be working fine. This update is dated 16/06/11.
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  1. this probably won't work but it's a theory. go to Control Panel\Hardware and Sound\Sound then look at playback devices. if there is only 1 then it won't work. It is quite unlikely. Another alternative would be to use ypbpr cables http://www.amazon.com/Belkin-PureAV-AV21000-06-6-Foot-Component/dp/B0001VWHGS/ref=sr_1_5?s=electronics&ie=UTF8&qid=1338453545&sr=1-5 and then get a regular 3.5mm to av http://www.ebuyer.com/143529-belkin-pure-av-blue-series-audio-splitter-av20600qp03?utm_source=google&utm_medium=products
    Hope this helps :)
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