Lenovo Thinkpad SL400 No Sound - Lenovo SL400 (secondhand Laptop) thinkpad under win7 - xp and vista was istalled audio conexant driver but no sound output headset and speaker - when play music no audio out just sound like breb brep twice - the problem was in soundcard - when you try to update bios still not solve - try to reset soundcard IC with flash bios from external instrument or reball that chip. it was successfull way.
