K7VAT
System Board 37
HDD LED
This LED will light up whenever one of your IDE devices is being accessed. Usually this
will be a harddisk, as such the name HDD LED.
TB-LED
This is the Turbo LED, this LED is always on and is similar in function to the Power LED.
Ext-SMI
This is the External System Management Interrupt Button connector. Connect the second
button on your ATX case to this connector. Pressing that button will force the system into
suspend mode. (The BIOS allows specifying of the suspend state, and of the wake-up
events that can wake the system up again).