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v Duplicate SCSI IDs in the same SCSI chain
v A missing or incorrectly installed SCSI terminator
v A defective SCSI terminator
v An incorrectly installed cable
v A defective cable
For any SCSI error message, follow these suggested actions in the order in which
they are listed until the problem is solved:
1. Make sure that external SCSI devices are turned on before you turn on the
2. Make sure that the cables for all external SCSI devices are connected correctly.
3. If an external SCSI device is attached, make sure that the external SCSI
4. Make sure that the last device in each SCSI chain is terminated correctly.
5. Make sure that the SCSI devices are configured correctly.
Solving power problems
Power problems can be difficult to solve. For example, a short circuit can exist
anywhere on any of the power distribution buses. Usually, a short circuit will cause
the power subsystem to shut down because of an overcurrent condition. To
diagnose a power problem, use the following general procedure:
1. Turn off the server and disconnect all ac power cords.
2. Check for loose cables in the power subsystem. Also check for short circuits, for
3. Remove the adapters and disconnect the cables and power cords to all internal
4. Reconnect all ac power cords and turn on the server. If the server starts
If the server does not start from the minimum configuration, replace the components
in the minimum configuration one at a time until the problem is isolated.
Solving Ethernet controller problems
The method that you use to test the Ethernet controller depends on which operating
system you are using. See the operating-system documentation for information
about Ethernet controllers, and see the Ethernet controller device-driver readme file.
Try the following procedures:
v Make sure that the correct device drivers are installed and that they are at the
v Make sure that the Ethernet cable is installed correctly.
server.
termination is set to automatic.
example, if a loose screw is causing a short circuit on a circuit board.
and external devices until the server is at the minimum configuration that is
required for the server to start (see "Solving undetermined problems" on page
175 for the minimum configuration).
successfully, replace the adapters and devices one at a time until the problem is
isolated.
latest level.
– The cable must be securely attached at all connections. If the cable is
attached but the problem remains, try a different cable.
– If you set the Ethernet controller to operate at 100 Mbps, you must use
Category 5 cabling.
– If you directly connect two servers (without a hub), or if you are not using a
hub with X ports, use a crossover cable. To determine whether a hub has an
X port, check the port label. If the label contains an X, the hub has an X port.
173
Chapter 5. Diagnostics
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