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While your mute/rotation rocker might be fine, the system might have overrode it. It's happened to me when using Garageband. Doubleclick home and scroll left to the volume/mute control and check there.

Thank you! this is a solution, my new ipad now playing sound. Thanx again for your review
 
no sound playing ipad2 games.

Just got my iPad 2 yesterday, love it. However, I downloaded the ABC, Real Racing 2, and Flight Control apps. I made sure my volume and ringer was turned all the way up, but still no sound.

Had same problem. tried reseting no good.
Simply went into mute button settings and changed function from screen lock to muting and all good.
 
Just fixed the same issue with mine. Doubletap home button, scroll left to right, tap speaker button, BAM fixed. LOVE IT!
 
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