Hi GREESHMAGRAJ,
Welcome to Sony Community!
You may try to follow the steps in the link below to troubleshoot the issue on your laptop.
If the issue persists, it's better that you send the unit back to the repair center to have them check it. For further assistance regarding your concern, please contact the Sony offices/Sony representative offices nearest to your place of residence in Asia Pacific region http://www.sony-asia.com/countryselector.html?hpid=countryselector:AsiaPacific. Due to proximity, they are in a better position to respond to your questions or concerns.
Regards,
Jen
Answered your question? Glad I could help! Please Click the "Accept as Solution" button below.