If so there is nothing you can do as a home user.
The motherboard might have rusted making for poor contacts. There is one guy in New York (you can find him on YouTube) who has had some success in de-soldering/cleaning and re-soldering Mac motherboards.
Thank you for addressing my issue. hope u doing well. I'm from Pakistan, it is difficult for me to access him there in New York. I didn't spill water on it. It was working nicely and next evening the issue started.