Sony Vaio laptop keyboard, mousepad, and all buttons not working

Hello,

The keyboard, mousepad, and all buttons stopped working. I can use an external mouse or the virtual keyboard only. The keyboard is clean, no debris or liquids. I've tried Function keys as answered in other similar questions, but that's not fixing it, probably because it's just not recognizing any input from the keyboard.

What else can I do to restore the keyboard/mousepad functionality in the laptop?

Thank you all for your helpful answers.