Dell Dimension C521 - Manual (Page 27)

10. Replace the computer cover. See Replacing the Computer Cover .
11. Connect your computer and devices to electrical outlets, and turn them on.
Power Supply
Replacing the Power Supply
1. Follow the procedures in Before You Begin .
2. Disconnect the DC power cables from the system board and the drives.
Note the routing of the DC power cables underneath the tabs in the computer chassis as you remove them from the system board and drives. You must
route these cables properly when you replace them to prevent their being pinched or crimped.
3. Remove the two screws that attach the power supply to the back of the computer chassis.
4. Press the release button located on the floor of the computer chassis.
1 heat sink assembly 2 heat-sink assembly bracket 3 captive screws (2)
NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis.