MacBook Pro Mid 2012 not turning on after charging despite battery indicator lights

I have Macbook Pro Mid 2012. Yesterday around 12nn, before I leave the house, it’s still working and I am still able to use it, it was on 30%. When I came back from work I checked it and it’s not turning back on. Assumed that it might be drained since I left it on sleep mode. I tried to charge it for 30mins, the charger’s light is green and the battery indicator’s light shows 3 led lights only. After charging it for 30mins, it’s still not turning on, so I left it for 2 hours. But still doesn’t turns on, so I unplugged it from the charger and just let it be. I have decided to bring it to an expert the next day to check. But like after 10 hours being unplugged from the charger, I saw a white blinking on my laptop and checked if it’s already working, and yes it turned on. The battery was still on 30% and I charged it. I let on sleep mode while charging it since I am doing something. This time the color of the charger’s light was amber and after 2 hours I tried checking it and it does not turn on again. I can say that it charged since the battery indicator’s light was on 7-8 led lights. But I really don’t know why it does not turns on. All through out this issue I did SMC reset and holds the power button for 10seconds for numerous times and it does not work. Can someone help me to fix or tell me what would be the problem is?

[Re-Titled by Moderator]

Original Title: MACBOOK PRO MID 2012 NOT TURNING ON EVEN THOUGH IT WAS CHARGED