As per your descritption, it might be due to AC adapter problem which is not giving enough power to notebook to power on. However, try to power on the notebook only on battery power or alternate AC adapter. If it does not turn on, then it might be due to motherboard problem due to some short circuit in the AC adapter.
Additionally, please perform the below steps before trying the above procedure:
1. Shut the computer down.
2. Disconnect the AC adapter and remove the battery.
3. Press the power button down for about 30-60 seconds.
4. Reconnect the AC adapter and the battery.
5. Restart the computer.
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