20MB-662User ManualSystem Status LED Pin Header (JP13)LED indicator for system status, it serves as an early warningindicator and as well as a quick troubleshooting indicator. Justfollow the pin definition for each 7 LEDs illustrated below:PinSignalPin Signal1Power_ON LED2Vcc3CPU_fan LED4Vcc5System_fan LED6Vcc7HDD_access LED8Vcc9Low_temperature LED (option)10Vcc11High_temperature LED (option)12Vcc13LAN_access LED14Vcc