I have an IBM Thinkpad T42 and the sound stopped working a couple days ago. Device Manager says everything is working properly, but when I go to the Sounds option in Control Panel, it says there is no audio device installed, which is incorrect because it was working fine until now. Tried to reinstall the driver from the Lenovo website (twice) and it does nothing. The computer still makes the usual log-in log-out sounds but will not make any others.

Sound driver for IBM is soundmax. Go to the device manager, right click the sound devices, remove them. reboot and it should reinstall the drivers. could just be a odd conflict, the fix above should get it going again.
Or If you've installed the correct driver for your computer and OS and still no sound:Open Control Panel>Sound and Audio Devices>Audio tab>Sound Playback, Default Device, should something like Realtek...., AC97... If not the driver is not correct or the installation of the driver failed.
If the driver shows to be as described above. The issue is: Mute turned on, Volume too low, speakers not connected properly, no power to speakers , speakers not powered on.

Check heead jack

please connect headphone in your laptop head phone jack and check sound


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