Support No sound at all!

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http://androidforums.com – I've got this phone three weeks ago from MetroPCs and so far they had to replace it twice and now with this third phone which I had for only two days out of nowhere the sound stop working (When I play music or when I get a call or even when I'm trying to talk to someone). I haven't dropped it and it hasn't been water damage or anything. Any idea what might be wrong with it before I take this one back and demand my money back lol? (General)