IBM 865951Y Hardware Maintenance Manual - Page 94

SCSI Hard Disk Drive In-Use Light, Primary Microprocessor Activity Light

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Page 94 highlights

1 Power-On Light: This green LED blinks when the server is in Standby mode (power is present but the server is not turned on). The blinking changes to a solid (continuous) light when you turn on the server remotely (Unattended mode) or by pressing the Power-On Switch. If this light is not on, the power cord is not connected or the power supply has failed. 2 POST Complete Light: This green LED lights when the server completes the power-on self-test (POST) without any errors. 3 SCSI Hard Disk Drive In-Use Light: This green LED lights when the server is accessing a SCSI device. If this light remains illuminated, it might indicate that either the SCSI bus or the system microprocessor has stopped. 4 Primary Microprocessor Activity Light: This green LED blinks to indicate the activity of a microprocessor installed in the primary microprocessor socket. The LED comes on during POST to indicate the presence of the microprocessor. 5 Secondary Microprocessor Activity Light: This green LED blinks to show the activity of a microprocessor installed in the secondary microprocessor socket. The LED lights during POST to indicate the presence of the microprocessor. When you install a secondary microprocessor, it becomes the startup microprocessor. 6 System Error Light: This amber LED shows that a system error occurred. System errors can include high temperature, excess current, or failure or errors in the microprocessor, system fan, memory, PCI bus, SCSI bus, USB, hard disk drive, diskette drive, serial port, keyboard interface, or power supply. When this LED is on, one or more LEDs on the system board also might be on, indicating where the error occurred (see "System board LEDs" on page 142). 7 Reserved: This LED is reserved for future use. 86 Netfinity Server HMM

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±1²
Power-On Light:
This green LED blinks
when the server is in Standby mode
(power is present but the server is not
turned on).
The blinking changes to a
solid (continuous) light when you turn on
the server remotely (Unattended mode) or
by pressing the Power-On Switch.
If this
light is not on, the power cord is not
connected or the power supply has failed.
±2²
POST Complete Light:
This green LED
lights when the server completes the
power-on self-test (POST) without any
errors.
±3²
SCSI Hard Disk Drive In-Use Light:
This
green LED lights when the server is
accessing a SCSI device.
If this light
remains illuminated, it might indicate that
either the SCSI bus or the system
microprocessor has stopped.
±4²
Primary Microprocessor Activity Light:
This green LED blinks to indicate the
activity of a microprocessor installed in the
primary microprocessor socket.
The LED
comes on during POST to indicate the
presence of the microprocessor.
±5²
Secondary Microprocessor Activity
Light:
This green LED blinks to show the
activity of a microprocessor installed in the
secondary microprocessor socket.
The
LED lights during POST to indicate the
presence of the microprocessor. When you
install a secondary microprocessor, it
becomes the startup microprocessor.
±6²
System Error Light:
This amber LED
shows that a system error occurred.
System errors can include high
temperature, excess current, or failure or
errors in the microprocessor, system fan,
memory, PCI bus, SCSI bus, USB, hard
disk drive, diskette drive, serial port,
keyboard interface, or power supply.
When this LED is on, one or more LEDs
on the system board also might be on,
indicating where the error occurred (see
“System board LEDs” on page
142).
±7²
Reserved:
This LED is reserved for future
use.
86
Netfinity Server HMM