Happened to me a shit ton of times on this laptop I used to have that was from like 2006. I bought like 5 different replacement chargers with the same power, and I even had a replacement battery on it. The new charger I purchased busted out so I gave up and just bought a new laptop.
I have no idea why this happens. I have a feeling that it's the battery that is causing the problem. Pissed me off as well since it cost me a shit ton to purchase all those chargers, and especially the battery pack for the laptop.
The DC jack isn't connected to the Mobo in 99% of cases. So if there is a problem, it should be pretty evident as soon as you open up to look at the mobo, and at that it should be easy to fix if it is broken.
I have the same problem, it's prolly because of the jew charger I got from China. Boh1 it is worth looking at the charger port though.
There are two types of tragedies in life. One is not getting what you want, the other is getting it.
If you wake up at a different time in a different place, could you wake up as a different person?