Windows 7 sound not working

I have a Lenovo Thinkpad x230 running windows 7 x64. When I boot the laptop I get the normal windows sounds but I try to play music or something via youtube there is no sound.
On investigation I have found that if I go to control panel, sound, select the speakers and the advanced tab. By changing the default format from one value to another and applying the sound will work correctly until the laptop is rebooted.
Once rebooted if I check the default sound format the previously selected format has been retained but no sound until I change it. I have tried changing between all available formats from CD quality to studio quality. Each and every format will work for the specific session but when the laptop is rebooted I have to change to format.

Any help you can offer would be great as I have a customer waiting to take delivery of the laptop.

Thanks in advance
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AdrienneSperberTech Support CoordinatorCommented:
You might want to try removing the audio driver and letting it reinstall after a reboot of Windows.

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wsmythAuthor Commented:
I have tried this and applied all system specific updates as well as all available Windows 7 updates.
AdrienneSperberTech Support CoordinatorCommented:
Do you have Realtek sound driver installed or Dolby software?  It seems others with the same model laptop have had the same issue.  Try uninstalling either or both and see if the problem is fixed.
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AdrienneSperberTech Support CoordinatorCommented:
Also possibly a workaround if you have Realtek installed:

Workaround is to select the Multistream mode from Realtek control panel, Device advanced settings
wsmythAuthor Commented:
I will have to park this until Wednesday as customer needed to take the laptop. Thanks for the suggestions I will post back ASAP.
If there is an audio manager in control panel all control panel items?
 take a look in there and see if it is set to headsets/headphones as default change to speakers, could be the audio manager overriding the settings.
Would explain when you reboot it defaults to something else.
An Audio Manager is like Realtek HD Audio manager or the name of the sound card. Sigmatel or something else
With a laptop as there is shared resources between speakers and headphones what is set as default?
Always apply and ok out of the changes
Ensure only 2 speakers
Right click the speaker icon on the taskbar >volume control options.
check it is ticked to use All devices currently playing sound
 ok out of that
In the playback highlight the speakers then properties> in enhancements untick everything use the scroll bar and scroll down to check the hidden
In advanced 24 bit , 48000 Hz quality apply ok
back in playback highlight the digital output>properties>enhancements >disable all sound effects, Leave immediate mode
click test wherever there is one
Restore defaults wherever possible, possibly one setting is not working with another
 reboot and test with mp3 on the HDD. at boot left click the volume icon and see it is has resumed to zero?

Look in device manager> view >show hidden devices
If that fails you could try the system restore
try the windows troubleshoot at the start orb windows help and support
wsmythAuthor Commented:
I ended up having to remove the Realtek software/driver completely and leave it off the system.
Bad drivers was it?
wsmythAuthor Commented:
Seems so. Specified Lenovo drivers provide no available options in Realtek control panel.
When removed HD Audio works ok. If I get time I will try driver direct from Realtek
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