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Figure 4. System board part locations
1 4-pin power connector 13 Front panel connector
2 Microprocessor
14 Clear CMOS (Complementary Metal Oxide Semiconductor)
/Recovery jumper
3 Microprocessor fan connector
15 Front USB connectors (2)
4 DIMM 2 16 Front audio connector
5 DIMM 1 17 Internal speaker connector
6 DIMM 4
18 PCI card slots (2)
7 DIMM 3
19 PCI Express x1 card slot
8 Thermal sensor connector
20 PCI Express x16 graphics card slot
9 24-pin power connector
21 System fan connector
10 SATA connectors (3) 22 Cover presence switch connector (Intrusion switch
connector)
11 eSATA connector
23 Battery
12 Power fan connector
24 PS/2 keyboard and mouse connector
Locating internal drives
Internal drives are devices that your computer uses to read and store data. You can add drives to your
computer to increase storage capacity and enable your computer to read other types of media. Your
computer comes with the following factory-installed drives:
• A Serial Advanced Technology Attachment (SATA) optical drive in bay 1
• A 3.5-inch card reader in bay 3 (installed in some models)
• A 3.5-inch SATA hard disk drive in bay 5
72 Hardware Maintenance Manual