Intel G41 Express Chipset User Manual page 11

(2) ATX 12V Power Connector (4-pin block) : ATX12V
This is a new defined 4-pin connector that usually comes with ATX Power
Supply. The ATX Power Supply which fully supports AM2 processor must
including this connector for support extra 12V voltage to maintain system power
consumption. Without this connector might cause system unstable because the
power supply can not provide sufficient current for system.
(3) PS/2 Mouse & PS/2 Keyboard Connector: KB1
The connectors are for PS/2 keyboard and PS/2 Mouse.
(4) USB Port connector: USB ports from USB1, UL1
The connectors are 4-pin connectors that connect USB devices to the system
board.
(5) LAN Port connector: RJ-45 LAN from UL1
This connector is standard RJ-45 connector for Network which supports
10M/100Mbps data transfer rat
(6) Audio Line-In, Lin-Out, MIC Connector:
This Connector is 3 phones Jack for LINE-OUT, LINE-IN, and MIC
Line-out: (GREEN)
Line-in: (BLUE)
MIC: (PINK)
PS/2 Mouse Port
PS/2 Keyboard Port
(8) Primary IDE Connector (40-pin block): IDE
This connector connects to the next set of Master and Slave hard disks. Follow
the same procedure described for the primary IDE connector. You may also
configure two hard disks to be both Masters using one ribbon cable on the
primary IDE connector and another ribbon cable on the secondary IDE
connector.
20-pin power plug
Audio output to speaker
Audio input to sound chip
Microphone Connector
Serial Port
AUDIO1
RJ45 LAN
VGA Port
USB Ports
8
24-pin power plug
Line-IN
Line-OUT
MIC-IN