No sound when trying to use Playstation 3 through Alienware M17x R3.

I'm trying to use my Playstation 3 through my M17x R3, which I've done before about 9 or so months ago. Everything works fine now, except there's no sound. I've looked through sound output options in my PS3 and it's how it should be, going through HDMI. I can't think of why it won't play sound now, even though it's worked before.

Any ideas? Thanks
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More about sound playstation alienware m17x
  1. Have you tried a different cord?
  2. Have you tried a different cord?
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