Hi devgrover

I had a similar problem with my Dell Laptop that was a driver issue.
Like Kemical says in the previous post, try your makers website for the latest drivers. If that does not work check device manager and try updating present driver to later version. Still no joy, try rollback to previous driver(still in Device Manager). If you have still no audio you might try Sigma Tel High Definition Audio CODEC that worked for my self. (Dell Inspiron)

Post back with your laptop specs. if none of these things work!!