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Loosen the 4 fastening screws on the backside, which are used to fix the power supply unit at the housing.
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Loosen 2 screws each on the left and the right side, which are used to fix the bar (1) and remove the bar.
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Disconnect all cable connections to the mainboard and the drives.
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Remove the power supply unit (2) from the housing, by pulling it backwards and lifting it out.
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In order to install a new power supply unit, proceed in reversed order.
