This notebook is Dell Vostro 5460 (Service Tag : 6FYW1Y1). After I have brought this notebook come to check, maybe it has problem on the keyboard only. So, I have proposed to Captain Paitoon, if we purchase a new keyboard for replacement it instead. They are ok or not? Captain Paitoon said ok can, if changed and it can working as usual please do it for them too. Because they ever asked IT shop for solve this problem already. But total price it very expensive, around 8,000-9,000 THB. Thus now I have requested to my vendor for make this quotation to me already. I will update you again.