To remove the speakers, first remove the optical drive...

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...and the rear cover.

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Detach the speaker connector from the motherboard.

Free the speakers interconnector cable from the small cable guides at the bottom of the front bezel.

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Partially remove the speakers.

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Free the connector for the right speaker from its cable guides on the bezel...

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To replace the speakers, first replace the right speaker cable in its cable guide on the front bezel.

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Press the speakers down into their places on the bezel.

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Tuck the speaker interconnector cable into its guides on the bottom of the bezel.

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Replace the two screws for each speaker.