Try the following:
Remove the charger, then remove the battery pack from the laptop.
Press and hold the Power button for 30 seconds then release the button.
Connect the charger to the laptop and switch on the charger. (leave the battery out of the laptop at this stage).
Start the laptop.
If the laptop starts, allow it to boot all the way to the Windows desktop.
When the laptop has 'settled' down, (i.e HDD light is not continually on) shutdown the laptop in the normal way.
When the laptop has completely shutdown, switch off and remove the charger from the laptop.
Re insert the battery into the laptop, reconnect and switch on the charger and start the laptop.
If the laptop starts allow it to boot all the way to the Windows desktop. Once there check the charge state of the battery. If it is charging allow it to fully charge before switching off the charger and removing the charger from the laptop.