
4-3
Chapter 4: System Interface
Power: Indicates power is being supplied to the system's power supply units. This
LED should normally be illuminated when the system is operating.
Overheat/Fan Fail: When this LED ashes it indicates a fan failure. When continu-
ously on (not ashing) it indicates an overheat condition, which may be caused by
cables obstructing the air ow in the system or the ambient room temperature being
too warm. Check the routing of the cables and make sure all fans are present and
operating normally. You should also check to make sure that the chassis covers
are installed. Finally, verify that the heatsinks are installed properly. This LED will
remain ashing or on as long as the overheat condition exists.
NIC2: Indicates network activity on LAN2 when ashing.
NIC1: Indicates network activity on LAN1 when ashing.
HDD: Indicates IDE channel activity. SAS/SATA drive and/or DVD-ROM drive
activity when ashing.
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