So my wife has had this laptop for few years now... all of a sudden one day, it no longer would turn on.

Upon Googling it, I found out that there's a battery reset pin hole on the bottom that "resets" the battery.
I did that and let it sit for a few minutes, plug back the power and turn it on but only flashed for a very brief time.

I am thinking of replacing the battery altogether now... do you guys think that will be the major culprit?
Or am I just sinking the money into a pit?