Let us know the model of the system.
Unplug the adapter and battery. Press and hold power button for 20 seconds. Plugin the adapter and battery. Turn on the system. If the system does not turn on, repeat the process and try turning on the system with adapter only.
Provide the status of the power button LED and listen for beep codes.
Please keep us posted.
Thanks & Regards
message edited by DellManshuS