Power button doesn't start the laptop

So it allow charge .but pushing the power button doesn't turn the computer on or off.which means I don't know how to work on the lap top.so it has been a month with such problem.best buy said they can't fix it .if they had such issues they ship it to hp.i asked them should I buy new mother board where honestly I don't know how to replace the motherboard.i opened it googled it.its like may be the wires inside got disconnected where pushing the power button has no effect.

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So it can't be fixed by disconnect the battery and remove the charger the problem with the power button that completely acts as it's not connected to the motherboard of the laptop

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Only magic way to start the lap top buy using keys of combinations to act as power button which is wish or dream than reality

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