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v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, Type 8878 and 8879," on page 23 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Error code
Description
301-xxx-000
Failed keyboard test.
Note: After installing a USB keyboard, you
might have to use the Configuration/Setup
Utility program to enable keyboardless
operation and prevent the POST error
message 301 from being displayed during
startup.
302-xxx-xxx
Failed mouse test.
305-xxx-xxx
Failed video monitor test.
405-xxx-000
Failed Ethernet test on controller on I/O
board.
405-xxx-00n
No good link! Check loopback plug.
Real Time Diagnostics
Real Time Diagnostics can help you diagnose certain devices while the operating
system is running, to prevent and minimize server downtime.
For more information and to download Real Time Diagnostics, go to:
http://www-1.ibm.com/support/docview.wss?uid=psg1MIGR-50681.
Recovering from a BIOS update failure
The server has an advanced recovery feature that will automatically switch to a
backup BIOS page if the BIOS code in the server has become damaged, such as
from a power failure during an update.
130
IBM System x3950 Type 8878 and System x3950 E Type 8879: Problem Determination and Service Guide
Action
1. Reseat the following components:
a. Keyboard
b. I/O board
2. Replace the components listed in step 1 one at a
time, in the order shown, restarting the server
each time.
1. Reseat the following components:
a. Mouse
b. I/O board
2. Replace the components listed in step 1 one at a
time, in the order shown, restarting the server
each time.
1. Reseat the following components:
a. Monitor
b. I/O board
2. Replace the components listed in step 1 one at a
time, in the order shown, restarting the server
each time.
1. Make sure that Ethernet is not disabled in the
Configuration/Setup Utility program and that the
BIOS code is at the latest level.
2. Run the loopback diagnostic.
3. Reseat the I/O board.
4. Replace the I/O board.
1. Make sure that the loopback plug is a gigabit
loopback plug (see "Solving Ethernet controller
problems" on page 157).
2. Check for any loose connections between the
loopback plug and the Ethernet connector.
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