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Thanks dear. I followed the steps, first installed chipset driver,followed by graphic and sound. Now sound is working. ut stil 4 devices shows as yellow question mark wityh exclamation in the device manager.They are 1. Modem Device on High Definition Audio Bus 2. Network Controller 3. SM Bus Controller 4. USB Device Still the Wireless not installed.LAN working fine. how to solve that?

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Hi there,

Double click on the yellow exclamation mark in device manager,extract the driver in a folder and from device manager browse to it and it will install do it for all.