Replacing and Adding System Components
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15 Reconnect the power cord, the modem cord, and all external peripherals, then turn on the system.
10 Place the new power supply in the proper position in the chassis and line up the mounting holes with the holes in the chassis.
Handle
11 Replace the screws securing the power supply to the back panel.
12 Reconnect the power connectors to the system board and to all internal devices.

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