The 40 pin connector you got is the default shit for most hardrives, the new hardrive you have might need a cord that has a strip on it, like a strip on the side of a matress idk what its called I forgot, but thats weird that the hardrive doesnt support the connector you already have, the smaller port to the right is the power supply, and the little one on the left you dont necessarily have to connect it depends, its some audio shit with the motherboard, atleast thats how mine was.

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