You have a damaged power jack. This is internally connected to the motherboard. If you have experience in soldering you could do a self repair by soldering it back together. Otherwise you would have to take it to a repair shop to get it fixed.
The charging cord isn't the problem here. I've seen this a few times on laptops, and the fix isn't achievable by anyone other than an expert. The problem is the power socket that's soldered to the motherboard is loose (when you plug the charging cord into the computer, you're actually plugging it into the power socket attached to the motherboard). To fix it requires that socket to be re-soldered to the motherboard. I recommend consulting a professional computer repairman.
Take an ink pen and push the tip inside the jack and see if
the little pin wiggles, if so the jack is bad. You'll have to take the laptop
apart to fix it. Most times it is soldered onto the motherboard, so you
will have to desolder the old and solder a new one.
Symptoms of a broken power jack
1. If you wiggle the power cord or the AC Adapter connector on the back of the laptop, the power LED and battery charge LED start to flicker.
2. Battery will not charge in the laptop.
3. Laptop runs fine off a charged battery.
4. With the AC Adapter connected the laptop appears to be dead.
No power LED or battery charge LED activity.
5. Laptop randomly powers off without any warning.
If your laptop is out of warranty, then you can fix the problem by re-soldering DC-IN jack on the system board. If it
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