The power supply is fine, but the computer just won't switch on, is there a fuse inside of the casing that could've blown? why doesn't it work? Could it be the switch or hard drive?
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It doesn't power on at all? It could be your top case has failed. There are some pins you can touch on the logic board to boot it. You have to take the bottom off, plug it in, and follow these directions. If it comes on this way, your top case most likely needs replaced. I have seen this several times:
http://www.insidemylaptop.com/turn-on-ma...
I'm assuming the charging cord glows green or orange and that the battery is charging right?
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it could be the keyboard ribbon cable not plugged correctly, so when you press the power button, it doesn't turn on.
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