Windows 7 has no sound

The T61 sound card driver is normal. Windows 7 has no sound. Lenovo thinkpad T61 installs Windows 7 64-bit Ultimate, updated with Windows Update, most hardware drivers can be installed correctly. But I have encountered such a situation, the T61 sound card driver is normal Windows7 has no sound. The last reason is actually because Windows 7 automatically mutes the sound output after installing the sound card driver!

Windows 7 does not have Sound Device Manager recognized as SoundMax Integrated Digital HD Audio, the drive status is normal, & ldquo;This device is working properly.” But Windows 7 has no sound, please note that this time the screen The system bar volume icon in the lower right corner is normal! I immediately check out some possible errors:

Right click on -Playback devices-Speakers, already set as default device. Double-click the Speakers icon, switch to the Advanced tab, click the test button, you can see the waveform output next to the Speaker icon in the previous dialog box, the system does not have any error prompts. Execute eventvwr.msc to view the system and application logs without any related errors.

Windows 7 Sound Driver For such a weird problem, I tried to find the Microsoft Windows 7 KB knowledge base, but unfortunately. Although Windows 7 is already RTM, there is no information in the knowledge base. So I only tried to change the sound card driver, try the following steps: Uninstall the driver. Execute devmgmt.msc to open the device manager. Right click on SoundMax Integrated Digital HD Audio, select Uninstall, remember to check Delete the driver software for this device. Otherwise, the previous driver will still be copied back after the system restarts. Then disconnect the network (unplug the network cable, turn off the wireless), this is to prevent Windows Update from automatically updating the sound card driver. Clean up the registry key. Delete the key values ​​of the Windows 7 system registry that contain keywords such as Soundmax and Analog. This is to avoid Windows 7 misidentification of the sound card.

Note: After the above measures, after restarting Windows 7, the system recognizes the sound card as high definition audio device. Replace the sound card driver. Using windows 7 msinfo32 and third-party tool Everest, check the sound card chip model is ad1984, then try to replace several different drivers: Lenovo Windows Vista 32 bit/64 bit driver Realtek HD Audio audio chip latest driver package 2.24 Intel High Definition Audio driver driver wizard. Try installing a third-party software driver wizard to get the updated sound card driver from the driver home. After these steps have been tried, the Windows 7 system still can't hear the sound.