1. Slide the power supply into place, ensuring that the tabs on the rear wall of the computer chassis latch into place.
2. Replace the four screws that secure the power supply to the back of the computer chassis.
3. Replace the two hard drive bays.
4. Replace all hard drives installed in the interior hard drive bays (see Installing a Hard Drive).
5. Replace the optional hard drive fan, if applicable (see Installing the Optional Hard Drive Fan).
6. Reattach each of the DC power cables that were previously connected, carefully rerouting them as you found them.
7. Replace the computer cover (see Replacing the Computer Cover).
8. Connect your computer and devices to electrical outlets, and then turn them on.
Front I/O Panel

Front I/O-Panel Components

Removing the Front I/O Panel

1. Follow the procedures in Before You Begin.
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.
1
external IEEE
1394 port
2
external USB ports
(2)
3
power, diagnostics, hard drive, and
network activity LEDs
4
headphone
connector
5
microphone
connector
6
internal front panel I/O connector
7
bottom LED
connector
8
top LED connector
9
internal USB connector
10
power button
connector
11
internal 1394
connector
12
internal audio interface connector
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.