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