Hi Georgian,
Thank you for visiting Sony Community!
It is possible that this is a hardware issue (keyboard) since you already tried it while in BIOS. We do not suggest performing any "manipulation" to the keyboard or any internal part of the laptop. We recommend contacting the nearest Sony Authorized Service Center in your area for further assistance with this.
For further assistance, we kindly recommend visiting our Sony Global Website for information on contacting the Sony Support Center in your region at http://www.sony.net/SonyInfo/Support/.
Regards,
Vincent
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