Dell Precision 220 - Manual (Page 44)

4. If you are using a padlock to secure your system, reinstall the padlock.
Internal Views
Figure 6 and Figure 7 show your computer with its cover removed.
Figure 6. Inside the Mini Tower Chassis
Figure 7. Inside the Desktop Chassis
1 Securing buttons (2)
1 Externally
accessible
drive bays
2 Hard-disk drive
cage
3 Chassis
intrusion switch
4 DC power
cable
5 Drive interface
cable
6 AGP card
brace
7 Security cable
slot
8 Padlock ring
9 Expansion card
slots
10 I/O panel
connectors
11 AC power
receptacle
12 Power supply