Lenovo 3000 H Series User Manual page 48

Memory connectors(2)
Memory connectors(2)
Thermal sensor header connector
Power connector
Power fan connector
SATA IDE connectors(4)
E-SATA connector
Front panel connector
Front USB connectors(2)
Serial (com2) connector
Front audio connector
PCI adapter connector
PCI Express x1 adapter connectors(2)
PCI Express x16 graphics adapter connector
System fan connector
12V power connector

Hardware Replacement Guide