Dell Dimension C521 - Manual (Page 19)

8. Slide the drive into the bay until it clicks into place.
9. Connect the data cable to the connector labeled "FLOPPY" on the system board.
10. Replace the CD/DVD drive.
11. Check all cable connections, and fold cables out of the way to provide airflow for the fan and cooling vents.
12. Replace the computer cover. See Replacing the Computer Cover .
13. Connect your computer and devices to electrical outlets, and then turn them on.
Media Card Reader
Removing a Media Card Reader
1. Follow the procedures in Before You Begin .
2. Remove the CD/DVD drive (see Removing a CD/DVD Drive ) and carefully set it aside.
3. Disconnect the Media Card Reader USB cable from the USB connector (USB1) on the system board and route the cable through the clip on the shroud.
4. Pull up on the drive release latch and slide the Media Card Reader towards the back of the computer. Then, lift up to remove it from the computer.
1 floppy drive 2 slot verification number
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.
NOTE: It is not necessary to disconnect the cables connecting the CD/DVD drive in the following step, as long as the cables do not obstruct your
working area once the drive is set aside.
NOTICE: Do not pull the drive out of the computer by the drive cables. Doing so may cause damage to the cables and the cable connectors.