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You say it's a new battery. Is the battery the same EXACT spec? Some aftermarket batteries don't work well with your laptop. The pin-out/connections may be incompatible. That said, in your BIOS is there a "Battery Learning" section.
Remove the battery for at least 3 minutes... Then put it back and then plug in the charger and switch on the charger. If the battery is completely drained, it would take a while for the charging to initiate. Please have patience and leave it on charging even though without the charging indication for at least an hour. After that still if the charging indicator doesn't lit, then its definitely your charger or laptop. You will need to take it to a service centre in that case.
Take out the AC power jack and then remove the laptop battery. Plug AC power back in and see if the laptop will turn on. If it turns on let it boot the operating system and then shut down as normal, remove the power cord and reinsert the battery and again see if it will switch on. If it does then there has been a glitch with the battery. If it doesn't then there is a problem with the battery.
If the laptop won't switch on either with or without the battery then there is a possibility that the motherboard has developed a problem.
Laptops are so integrated that usually a system failure that involves power issues such as in your case where you cant get it turn on with anything on the screen mean the mainboard (motherboard) is damaged. This usually leads to buying a new laptop or paying for the board to be replaced which usually costs as much as the laptop.
Ifthe laptop battery is more than 3 - 4 years old then the battery could be wornout. Rechargeable batteries have a finite number of charge and discharge cyclesand will lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up atall.
ORThe battery shows a 100% charge but when the adapter is disconnected thebattery drops off to zero capacity in a very short time.
Ifthe battery drops to an unacceptable charge level then the battery needs to bereplaced.
Whenyou connect the power adapter into the laptop, does the power LED lightup? If not then -
The battery adapter or the adapter's power lead or the laptop's powersocket could be faulty.
Check power adapter's DCplug that connects into the laptop power socket with a multi-meter, the voltageshould be slightly higher than the voltage that is printed on the label on thebottom of the adapter. If the voltage is zero or way below the voltage that isprinted on the label then the power adapter is faulty and needs to be replaced.
If the adapter is OK thenconnect it to the laptop and power it up, then look at the power/batterycharging LED light and wriggle the power plug in the laptop's powersocket. 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.
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.
If the power supply does not run the laptop without the battery, then the problem is the jack in the laptop, over time the plug breaks free of the motherboard causing intermittent operation or no power. If the power supply runs the laptop without the battery, it is the charging circuits on the motherboard that is the issue.
This is one of the most common issues with Laptops. In fact the problem is with the Charging Component (socket/plug) on the laptop, when charger is plugged in and plugged out very frequently, this happens as the charging interface is being moved time and again and become loose. From your side, you can try cleaning the interface :
You can use a cleaning brush dipped in alcohol or acetone or similar cleaning solution to clean the socket.
If this isn't not successful and it boots up using a charged battery, then you are likely be necessary to replace the charging socket: