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RE: DEL Inspiron N5110

Unplug the AC adapter from the system, remove the battery and hold the power button for 30 seconds.

If that doesn't solve the problem, a mainboard replacement will be required - if the system is out of warranty, that will cost about $200-300 just for the board;  add another $100-150 in labor if you don't change it yourself and the repair becomes questionable from a cost/value standpoint vs. replacing the system.

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