Hi khucngao,
Welcome to Sony Community!
What is the current operating system of your laptop? How did you reinstall your operating system? If you think that it is a hardware issue, you may bring the unit to a repair center to have them check and fix the device for you.
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.
Jen
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