Cq50-142us windows 7 64 bit headphones work but no sound from built in Altec-Lansing speakers

I recently installed Windows 7 64 bit on my CQ50-142US after the hard disk died. I've installed all the drivers that apply, and in particular the Conexant driver for the built-in audio parts. The system has built-in Altec-Lansing speakers.
I get no sound from the built in speakers, but if I plug in stereo headphones to the front-panel headphone jack, they work and they produce stereo sound no problem.
I can't see any way to test the speakers. If the system has any built-in diagnostic capability, I can't find it.
A Google search suggests I'm not the only person with similar problems.
Suggestions?

You can isolate this issue to a hardware or software fault by running a live distro of Ubuntu linix. See step number 2 to install it to a USB memory stick.
If the device is not recognized by Ubuntu during its config operations that the probem is likely to be with the notebook's system board.
Is your notebook still within the standard one year warranty period?
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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Cq50-142us windows 7 64 bit headphones work but no sound from built in Altec-Lansing speakers

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