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Could be a bad battery and/or charger/AC Adaptor/DC Connector. Try to isolate the problem by removing the battery and then plugging the laptop charger in and starting the pc up. It should boot on the AC adapter alone. If it won't boot on the AC adaptor or it flickers and flashes while on the AC adaptor, I would first suspect the AC adaptor or the DC connector on the laptop (try wiggling the power plug at the PC to try and check the connector). If it behaves while on the AC adaptor without the battery present, I would suspect the battery. Either way, you may have to replace something.
The laptop probably isn't charging. Could be a bad d/c connector on the laptop or the battery is bad. Remove the battery and plug in the a/c adapter and see if it powers on. Wiggle the a/c plug in gently while pressing the power button on the laptop. It powers on and off briefly then I'd say it's the d/c jack on the laptop, bad sodder joint.
I'm assuming you are using a GENUINE Dell laptop charger designed for this model?
Check the end of the adaptor, if it is the type that has the centre pin, make sure it has not snapped off. Check the adaptor is putting out 20 volts DC by connecting a multimeter to the outer and inner parts of the DC jack.
Usually, the ac adaptor LED will flash green if there is no charge going to the laptop ("spitting back power"), however, a dead adaptor is often recognised by a lack of the lED light glowing
You can try with a universal adaptor, it will not charge the battery but at least will eliminate the charger or the charging circuit. If this also fails to power up the laptop, then the issue lies with damage to the motherboard
In the first place before the adapter was replaced you should have checked the power to the battery and the battery terminals. Now if there was no power from the adapter/adaptor pins then it is also possible that the wire is hort within and so the SMPS cuts off .
Since the charger was replaced then the voltage at the battery terminals must be checked to see if the power comes into the laptop for charging. If the laptop does not power ON even with a battery in full charge , then it is possible that mother board is faulty and a cost estimate is important before the board can be changed.-- compare with the cost of a new laptop.
Your battery charger/adapter connects to the DC Power Jack to power your laptop and charge the battery. Since the charger/adapter does 2 things, there are 2 "cells" inside it to do those 2 different things. It's not uncommon for one or the other (but not both) to fail. So, often just purchasing a new charger/adapter solves the problem you're having. It appears that yours is continuing to charge but has stopped "adapting" AC current to DC current to power the laptop directly.
1) Adaptor/Charger problem. (common) 2) Notebook power problem. (slight)
To check if there is a problem with your charger.
a) Plug in charger to any wall socket. b) Get a small solid wire (prefferably insulated). c) insert one end of the wire to the positive point of the adapter or the inner side of adapter. d) scratch the outer side of the adapter using the other end of the wire to check for sparks. a spark is highly visible on a 12v power. e) if no spark is created, then there could have been a problem with your charger.
It might possibly be due to the static charge accumulated on the battery conductors. Not to worry; Please remove the battery of the Laptop and without the charger connected, you need to hold the power button to turn ON the Laptop for 1 min. This will consume all the energy from the battery conductors.
This process is called power drain.
Now connect the battery and connect the AC adapter, now try to start the computer.
I am sure this will help you turn ON the computer.
You may be able to get a battery charger but its rare.
If you do wish to use the AC adapter, take care with positive and negative. Also the voltage of the battery is actually lower than the AC adapter in order to get charged. I don't know what is going to happen if you do choose to use AC adapter as battery. 75% chance that it will work.