Personal Computer Hardware Installation and Replacement Guide

Locating parts on the system board
The system board (sometimes called the planar or motherboard) is the main circuit
board in your computer. It provides basic computer functions and supports a
variety of devices.
Figure 4 shows the locations of parts on the system board.
1 Microprocessor and heat sink 13 Front USB connector
2 Microprocessor fan connector 14 TCM header connector
3 Memory connector 1 15 Serial (COM) connector
4 Memory connector 2 16 Internal speaker connector
5 Power connector 17 Front audio connector
6 Diskette drive connector 18 CD_IN connector
7 IDE connector 19 PCI adapter connectors (2)
8 Power fan connector 20 PCI Express x1 adapter connector
9 Serial ATA connectors (4) 21 Battery
10 Clear CMOS/Recovery jumper 22 PCI Express x16 graphics adapter
connector
11 Front panel connector 23 12 V power connector
12 Front USB connector 24 System fan connector
Figure 4. System board parts locations
8 Hardware Installation and Replacement Guide