Thank you for your question. I am Shefin and I look forward to helping you with your issue today.
Please try the following and let me know the model number of the computer, if the issue persists.
Remove all external devices, CDs, AC Adapter and battery from the computer. Keep the AC Adapter and battery unplugged.
Hold the power button down for 20-30 seconds. (Nothing will appear on the display and none of the lights will light up.)
Plug in the ac adapter ONLY. (Please note that a power indicator light should be lit on the ac adapter when it is plugged in).
Normally power on the notebook. Check if the issue persists.
Then, remove the ac adapter and insert the battery into the system.
Plug the ac adapter back into the system, the battery charging indicator light will light up.
If the issue persists, or you have any questions, please be back and let me know.
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S H E F I N