If you tried already removing the driver of your sound card from the device manager and re-installing its driver or updated it. Possible reason for not working is that your speaker might damaged already. In that case you go to the nearest service center of your laptop for servicing the said problem.
Check if the sound is coming from headphones or headset
Go to Start and type soundrecorder and record the sound and check if working.
Go to start, type device manager, check for sound, uninstall the driver and restart the machine and check.
Try
1. Remove the audio driver and reinstall it. (My Computer right-click > Properties > Device Manager > Audio Devices > Reinstall Drivers)
2. Check if some other software which you are using is controlling the audio driver. (Restart in Safe mode and see if the sound is working)
3. Take expert help from a technician..You sound card might have stopped working.
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