Dell Dimension 3000 - Manual (Page 28)

step 8 of the preceding procedure.
4. Reinstall the fan assembly .
5. Reinstall the microprocessor heat sink, and then lower the heat-sink shroud.
6. Reattach the cables to the system board.
7. Reinstall any cards.
8. Replace the floppy drive.
9. Replace the computer cover.
10. Connect your computer and devices to electrical outlets, and turn them on.
Power Supply
Removing the Power Supply
1. Follow the procedures in Before You Begin .
2. Remove the fan assembly .
3. Disconnect the AC power cable from the AC power connector on the back of the power supply.
4. Unplug the DC power cables from the drives and system board.
5. Remove the four screws that secure the power supply to the back of the computer.
6. Remove the power supply from the computer.
Replacing the Power Supply
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before removing the cover.