Hi jntu2013,
This could be due to the static power in the system or an hardware issue. I suggest you to release static power by following the steps provided below:
1. Remove the AC Adapter and battery.
2. Press and hold the Power button for 20 seconds and release it.
3. Reconnect the AC Adapter and the Battery.
4. Press the Power button and check if the system powers on.
Please let me know about your findings.