We specialize in dc power jack repairs on laptop computers. DC power Jack on the laptop is also known as an AC DC (direct current) power port, dc power input, laptop dc power connector, dc power socket, laptop prong, receptacle part, it is an inside piece in the laptop where the dc power plug (tip part of your AC adapter cable) plugs into.
It usually goes bad if for quite some time you had to wiggle the plug around to make the system power up or charge the battery, it also goes bad if you would accidentally drop the notebook computer from a table and it lands on a dc power plug that would push and break the inside power jack connector of your laptop.
Basically, if your laptop battery is not charging anymore, you have to wiggle or jiggle the plug and dc connector constantly to make the system work because the piece inside is loose, the screen flickers, then it is probably the dc power jack issue. If the laptop is at the point where it does not power up anymore at all then the jack is completely broke.