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I have a Lenovo running Win7-x64 (SP1), and after I put my laptop to sleep or hibernate, the computer won't play any sound after I wake it. The really strange part is that if I put the computer back to sleep/hibernate, it will play the sound when I wake it. (And it stops playing sound when I put the computer back to sleep/hibernate again). Rebooting the computer will also fix the problem. I have the latest windows updates and drivers.
There is a similar problem posted here, but there are no answers.
Restarting Windows Audio Endpoint Builder and then enabling the speaker (it had got disabled) on restart, worked for me – Alex Punnen – 2017-01-27T04:01:49.623
The "Windows Audio" and "Windows Audio Endpoint Builder" are started. And the audio level indicator is moving, but there's no sound. – RHPT – 2012-02-24T22:56:06.100
Are the drivers updated yet? – music2myear – 2012-02-24T23:07:06.290
I thought I had thet latest drivers, but apparently not. I updated the audio drivers and the problem resolved itself. – RHPT – 2012-03-01T06:02:03.953
Glad it worked for you. – music2myear – 2012-03-01T14:20:01.477