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First of all, make sure your device is switched off and unplugged.
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To remove the hard drive, unplug its screws in this cover.
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To access the motherboard, you must first remove the keyboard because underneath it screws should be removed to separate the base of the chassis from the top of the keyboard.
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Remove the keyboard connector from the motherboard
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Remove the top cover and remove the processor cooling fan.
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We now clean and remove the dust and sediments that hinder fan function and increase processor heat.
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