Specifications

5–4 Maintenance & Service Guide
Connectors and Jumpers
2. With system turned ON, are any LEDs lit?
LED Problem indicated Solution
None lit No power to the system. Make sure AC power cable is connected to
wall outlet and system power supply.
Make sure power supply connectors are
connected to the system board.
I/O expansion board
disconnected.
Make sure I/O expansion board cable is
connected.
The memory board is not
properly inserted or is
missing.
Make sure memory expansion card is firmly
seated.
Defective system board. Replace system board.
Defective power supply. Replace power supply.
1 Green Only partial power to system
board.
Make sure power supply connectors are
connected to the system board.
Electrical short. Check cables for pinching and/or damage,
and for metal making contact with any board.
Power supply may be crowbarred.
Defective power supply. Replace power supply.
Shorted VRM. Replace VRM. An internally shorted VRM
will cause the power supply to crowbar.
Defective system board. Replace system board.
1 Green +
Orange
Defective system board. Replace system board.
1 Green +
Blue
Unseated or defective
memory expansion board.
Reseat the memory expansion board.
Replace the memory expansion board.
1 Green +
Yellow
Low VRM output voltage.
(Text adjacent to the LED
shows which VRM is bad.)
Reseat indicated VRM.
Replace indicated VRM.
Replace processor(s).
1 Green +
2 Red
Processor A and Processor
B are reporting different
Voltage IDs. This occurs if
processor speeds are
different.
Make sure both processors are identical.
A VRM is pulling down a
Voltage ID line.
Replace VRM(s).