Lenovo ThinkCentre A51p - Identifying parts on the system board

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 that are IBM-installed or that you can install later.
The following illustration shows the locations of parts on the system board.
1 12V power connector 14 SATA 1 IDE connector (primary hard
drive)
2 Diskette drive connector 15 Cover presence switch connector
3 Speaker connector 16 Power supply connector
4 DIMM connector 4 17 PCI Express x1 slot
5 DIMM connector 3 18 PCI Express x16 graphics slot
6 DIMM connector 2 19 PCI slot
7 DIMM connector 1 20 PCI slot
8 Clear CMOS/Recovery jumper 21 Battery
9 Front Panel connector 22 Microprocessor
10 PATA IDE connector 23 Microprocessor fan connector
11 SATA 4 IDE connector 24 Microprocessor heat sink
12 SATA 3 IDE connector
13 SATA 2 IDE connector
Replacing customer replaceable units (CRUs) 3