Lenovo 90CS User Manual page 39

Identifying parts on the system board
The system board (sometimes called the motherboard) is the main circuit board
in your computer. It provides basic computer functions and supports a variety of
devices that are factory-installed or that you can install later.
The following illustrations show the locations of parts on the system board.
System fan header
Microprocessor fan header
Hard disk and optical disk drive
power connector
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2 3
12 11
Microprocessor and heat sink
Memory connector
SATA connectors (2)
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