MacBook Pro - Intel - No Sound/Audio

I have no sound/audio!
The things I have done are:
Checked the audio setup in System Preferences - All is ok, internal speakers on etc..
Updated all software and restarted.
Reset PRAM and SMC.
Things that I think may be related to the problem:
My battery has the "Service Battery" symbol.
Sound stopped working on an international flight (could this possibly affect anything in a MBP?)
So I'm a little stumped as what to do, I can't go under warranty as it's over 2 years old. I need to find a solution without spending money at Apple.
Any suggestions more than welcomed.
Thanks,
Jim

My next suggestion is what Shootist007 recommends, take it to the Apple store as it sounds as if it could be a hardware problem. Apple will diagnose it for free, then give you an estimate for repair. They usually work of a flat rate and will repair anything they find wrong. I had a MBP repaired for this rate rate and they replaced the logic board, hard drive, led backlight,keyboard, for the flat rate. (I just thought the HD had died) They found stuff I was not even aware of, so it is basically a new machine for about 1/3 the cost of replacement. (It was my kids and I didn't have the $$$$ to replace it. Well worth checking out. All the best

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