Power Button issue

Hello Everyone,

I have bought a used MacBook Pro late '13 with High Sierra on it and everything works fine, except the Power button. I'm unable to turn the MacBook on by just pressing the Power button alone. The button is functional for other tasks but using it for powering up the Mac is not possible.

I have found a temporary fix to power up my MacBook by pressing simultaneously either Control+Power button or Option+Power button but I guess this is not the default behaviour.