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It does sound like the DC jack, you will need to dismantle down to the motherboard, chances are the jack pin is not making proper contact with the main board, "the board is double foiled" when board has been completely removed you need to resolder the points where the DC jack sits. This is a very tricky repair and to involved to give step by step instructions, I recommend a professional.
If the power/battery LED light flashes and in a certain position thisLED light stays firm, then the power socket is either faulty or it has a drysolder joint where it is connected to the motherboard.
The laptop needs the motherboard removed to get access to the DC jack so it can be resoldered or replaced if it is faulty. This can be repaired but itrequires the laptop to be completely dismantled to get at this power socket andrepair. If you cannot DIY then I suggest you get a quote first.
Basically the input power socket need to be replaced. To get at this power socket will require the laptop to be completely dismantled to remove the motherboard to gain access to this power socket. If you find this too dificult to DIY then I suggest you get a quote from a computer repairer before you get this job done.
Problem with power socket on the laptop, it may caused by a dry solder joint and needs to be resoldered or the power socket may be faulty and needs to be replaced. Either way to fix this, it requires the laptop to be dismantled to get at this power socket. Get a quote to repair, as it could cost a few dollars.
If it is a faulty cord/plug on the power adapter, this can be checked with a multi-meter. When you connect the multi-meter probes to the power plug the voltage should be steady and the reading should be slightly higher then the voltage that is printed on the label on the bottom of the power adapter. If the voltages fluctuates as you wriggle the plug then you have a broken wire in the plug. Replacing the plug would not cost much.
You could have a faulty power adapter or the power input socket on the laptop is faulty.
Check the power adapter plug that plugs into the laptop with a multi-meter. The voltage reading should be slightly higher that the voltage that is printes on the label on the bottom of the adapter. If you get a zero or low voltage reading then the adapter is faulty and needs to be replaced.
If the adapter is OK then the power socket on the laptop is faulty, it may only need to be soldered due to a dry solder joint or replaced if faulty. To check if it is a loose connection, wriggle the plug in the socket and observer the charge LED, if it flickers on and off, then the power socket may oly needs resoldering. This requires the laptop to be dismantled to get access to the power socket.
There is no quick fix other than tapping or glueing it into a position that works. This is not a permanent fix and will fail again sometime.
The laptop power connector is either loose or faulty, the laptop needs to be dismantled to access the plug to resolder it (if loose) or replaced if faulty.