Software Sales: "What if it was the cable or HDD cable or something like that , it all depends. What if the Power cable is touching the board ?"

You cannot even begin to give advice if you have to ask "what if?" You should have asked the poster everything possible before giving advice. Which is what William is saying to you.

Before you give any kind of advice in future, make sure that you have enough information to gain probable cause and best solution. I could say "it's definitely your whole PC, best go and buy a new one" But one: its not true and two: I don't have all the relevant information.

And as William says five years in computers isn't a great deal.