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Check the LEDs on all the power supplies. If the LEDs indicate that the power supplies are working
correctly, do the following:
1. Turn off the server.
2. Make sure that the server is cabled correctly.
3. Remove or disconnect the following devices, one at a time, until you nd the failure. Turn on the server
and recongure it each time.
• Any external devices
• Surge-suppressor device (on the server)
• Modem, printer, mouse, and non-Lenovo devices
• Each adapter
• Hard disk drives
• Memory modules: the minimum conguration requirement is 1 GB DIMM per microprocessor (2 GB
in a two-microprocessor conguration)
The following minimum conguration is required for the server to start:
• One microprocessor
• One 2 GB DIMM
• One power supply
• Power cord
• Server RAID SAS adapter
• System board assembly
4. Turn on the server. If the problem remains, suspect the following components in the following order:
a. Power supply
b. Power-supply cage
c. Memory
d. Microprocessor
e. System board
If the problem is solved when you remove an adapter from the server but the problem recurs when you
reinstall the same adapter, suspect the adapter; if the problem recurs when you replace the adapter with a
different one, suspect the system board or extender card.
If you suspect a networking problem and the server passes all the system tests, suspect a network cabling
problem that is external to the server.
Event logs
Error codes and messages are displayed in the following types of event logs:
• POST event log: This log contains the three most recent error codes and messages that were generated
during the POST.
• System-event log: This log contains all the POST and system management interrupt (SMI) events.
System event log
The BMC implements the system event log (SEL) as specied in the Intelligent Platform Management
Interface Specication, Version 2.0. The SEL is accessible regardless of the system power state via the
BMC's in-band and out-of-band interfaces.
Diagnostic programs and messages
Whenever possible, the BIOS outputs the current boot progress codes on the video screen. Progress
codes are 32-bit quantities plus optional data. The 32-bit numbers include class, subclass, and operation
information. The class and subclass elds point to the type of hardware being initialized. The operation eld
represents the specic initialization activity. Based on the data bit availability to display progress codes, a
Chapter 3. Diagnostics 25