Hi, and thank you for asking your question.
Just to clarify, are you able to boot up the laptop with only the power charger connected?
Please reply back to me below. Thank you.
Please do this now:
Disconnect both the power adapter and the battery from the laptop first.
Next, press and HOLD down the Power button for atleast 30 seconds, and then release the button.
Next, re-connect only the power adapter and press the Power button one more time to turn the laptop back on.
Does it boot up all right this time? Do let me know.