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Do not have the laptop on while you open it.
You might be able to power it up while it is open, but that depends on how its assembled. Anyway, check the connections to the fans, check if heatsinks are securely attached, look for and remove excessive dust buildup.
If a fan has never worked, it will be much cleaner than the others, but if its a recent failure there wont be any visible difference. If you cant power the fan you could try and put 5V (the fan usualy has a marking on it for voltage so check that) across it.
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