Case Open Connector (Cn19); Cpu Fan Connector (C_Fan1) - Intel MX945GM2 Hardware User Manual

1.8.8 Case Open and Speaker Out Connector (CN19)
1.8.9

CPU Fan Connector (C_FAN1)

Do not forget to connect the fan cables to the fan connectors.
Insufficient air flow inside the system may damage the
motherboard components, and hardware monitoring errors can
occur if you fail to plug this connector.
These are not jumpers! DO NOT place jumper caps on the fan
connectors.
User's Manual
MX945GM2 39