Universal low sound output

I have a Lenovo ThinkPad T410 laptop computer running 64-bit Windows 7 Pro. Several days ago, the sound output dropped dramatically. With sound levels set to 100%, the sound level is still quite low. I have my laptop hooked up to Harman Kardon soundsticks. The speakers are fine; I tested them by running sound from a tablet through them. There is no separate sound card: it is integrated.
I've attached a screen shot of the "Intel Display Audio" qualities. I have a feeling it's a hardware problem.
Experts please advise.
Thanks!
sound.JPG
John_HolecekAsked:
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dbruntonConnect With a Mentor Commented:
Try booting from a Live Linux CD such as Ubuntu https://help.ubuntu.com/community/LiveCD

If the sound level using that is low compared to what you are normally used to then it is definitely hardware.
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John_HolecekAuthor Commented:
I just ran a deep diagnostic on my computer, and everything passed.
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nobusCommented:
you can also do a system restore to a time  it was running fine.
check also in device manager for errors - and update the sound driver
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John_HolecekAuthor Commented:
The sound driver is the latest. No errors in device manager. Will try a system restore.
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John_HolecekAuthor Commented:
It is a hardware problem (darn it!)
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