Lenovo G50-80 no sound

[Ngazek]

Lenovo G50 sound lost suddenly. Both build in speakers also ear phones are not working. There is no exclamation mark with the sound device in device manager. And i tried to update driver from device manager but said I am having the latest driver. I disabled sound driver and enabled but still not working. I tried to reinstall the sound driver and delete it but I got a notification that sound driver cannot install because device not found. I tried again realtek sound driver, installed success but still getting no sound and device manager showing no realtek name. See device manager image below. Please help me friends

 

[fireberd]

This is identical to what has been posted on the Win 8 forum. ?????