Why my MacBook can't power up?

Today I followed the step to remove the logic board and the fan, and then I cleaned the dust, assembled again.

But.....no light on MagSafe, and when pressing the power button, there was no life sign....

I'd tried SMC, but no life sign neither.

I wonder what the problem might be?

Thank you.

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Why did you remove the logic board? Was it not starting before reassembly?

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I wanted to clean up the CPU side on the Logic Board and touch pad, they were covered with dust. But....you know the rest. Thank you fellows, I will try you suggested. English is not my primary language, so there might be mistakes in grammar.

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It worked fine before reassembly, an insect crawled into the computer and I found its dead body.

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If you removed the heat sink you must reapply a thin coat of thermal paste. (This would not cause a power on failure, but you don't mention reapplying thermal paste - it is an essential step to stop overheating)

Double check the reassembly of all the connectors, especially those to the internal mag-safe, keyboard and the HD. They are easy to destroy if you do not remove them carefully.

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Thank you machead3, I reassembled but it didn't work. I didn't remove the heat sink. I think some little part on Logic Board is broken, so changing another Logic Board might be my final option.

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Albert will be eternally grateful.
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