03-24-2017 03:28 AM
If you are referring to just unplugging the power cord from laptop, just gently pull it straight out away from the laptop.
There is nothing that locks it in place really, so It should not take too much force to unplug it, but do not force it up and down etc...just straight out.
The plug should be rectangular like the one shown in the image below.
03-24-2017 11:55 AM
Sorry, I did not realize you were trying to remove the actual jack. The DC Power jack is soldered on the system board in several places (seven in all I believe, 5 on the back, and one on each side), and should just lift off once all the solder is removed.