How (why) did this work? [View all]

I had been busy for a few hours, doing laundry, etc. Then about 30 minutes ago I grabbed my laptop but when I pushed the power button nothing happened.
I can run it either on a battery source, or with the power (electricity) cord. I tried each, but I had no power and couldn't turn on my laptop.

There is a tiny light on the side of the laptop. If it is fully charged, the light is white. If I’ve been using it on the battery, as the power drains, the light is yellow.
I looked at the light and it had no color.

Long story short (too late), I used Google on my smart phone and found the solution.

1. Remove the battery
2. Disconnect the power cord
3. Hold down the power button for 15 seconds.
4. Reinstall the battery, and connect the power cord
5. Push down the power button, to turn on the laptop

Now it’s working fine.
I don't know why or how removing all power sources makes the power work again.

I thought my laptop had died, and it was either pay to fix it or replace it.