Personal Computer Hardware Installation and Replacement Guide

Identifying 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 location of parts on the system board.
1 Microprocessor 9 PCI slot
2 Clear CMOS/Recovery jumper 10 Front USB connector 2
3 Thermal sensor connector 11 Intrusion switch connector/Cover
presence switch connector
4 Battery 12 Front I/O and LED/Switch header
5 Memory slots (2) 13 eSATA connector
6 Internal speaker connector 14 Internal power distribution connector
7 Serial (COM) connector 15 Fan connector
8 SATA connectors (2)
Figure 4. Locating parts on the system board
Chapter 2. Overview 9