Why does my volume stop working?

When I open music on my iPhone 4S, I choose a song and the volume control is grey. It will not play out loud or through my headphones even though it says it's playing. I have tried to reset my phone and have called apple. I have no idea what to do. It comes in waves. One second myosin won't play and then it works fine. But only for seconds before returning to the grey volume control

Go to Apple menu / About This Mac / More Info... / System Report ...
Under Hardware (left column) select audio. This is what I see:
Do you see the items listed on the right? If you do not, it is a hardware problem.
(Mine is a MB Pro, but you should see pretty much the same on a Macbook.)

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