Dell Dimension XPS T___ - Manual (Page 47)

Back-Panel Features
1 Power supply
2 DC power cables
3 Diskette-drive interface cable
4 Secondary hard-disk drive bracket
5 Drive cage
6 Drive bays (typical)
7 Power indicator
8 Power button
9 Hard-disk drive access indicator
10 Reset button
11 Bezel
12 Card-guide assembly (contains primary hard-disk drive)
13 Chassis
14 Filler brackets
15 System board
16 Chassis cooling fan
17 Support beam (on some models)