SUPER MICRO Computer Supero SC512 - Manual (Page 29)

4-3
Chapter 4: System Interface
 NIC2: Indicates network activity on GLAN2 when flashing.
 NIC1: Indicates network activity on GLAN1 when flashing.
 HDD: Indicates IDE channel activity. SAS/SATA drive, SCSI drive, and/or
DVD-ROM drive activity when flashing.
 Power: Indicates power is being supplied to the system's power supply units.
This LED should normally be illuminated when the system is operating.