21.
USB 2.0 connector
22.
USB 3.0 connector
23.
SATA1 connector
24.
SATA3 connector
25.
Internal speaker connector
26.
ATX power connector
27.
Hard drive and optical drive power cable
connector
28.
SATA0 connector
29.
Internal USB connector
30.
Coin cell battery
31.
RTCRST/Password clear/MFG Jumper
27