Sounds to me like the transformer circuit that enables the batery to charge. If you have bought your machine within the last 12 months it should still be covered by warranty so go back to the supplier. If not covered I wouod still try as it is not beyond reasonable expecations that the machine will operate perfectly in very way for more than 1 year.
Check your DC Power Jack which is where the power cord plugs
into the computer is bad. 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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Milwawkee works with power cord but batteries are charged and turns on for 3 secs and turn straight off again?
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