Diagnostics 13
The s yst e m ma in ta ins t h e t es t-l og da ta w hi le t he se rver
is powered on. When you turn off the power to the
server, the test log is cleared.

Diagnostic error message ta bles

For descriptions of the error messages that might appear
when you run the diagnostic programs, see “Diagnostic error
codes” on page 133. If diagnostic error messages appear
that are not listed in those tables, make sure that the server
has the latest levels of BIOS, Advanced System Manage-
ment Processor, ServeRAID , and diagnostics microcode
installed.

Power checkout

Power problems can be difficult to troubleshoot. For
instance, a short circuit can exist anywhere on any of the
power di stributi on bus s es. Usually a shor t circuit will cause
the power subsystem to shut down because of an overcur-
rent condition.
A ge ne ral proc edure for trou bl es hoo ting po w er pr o bl em s is
as follows:
1. Pow er off the system and disconnect the AC cord(s).
2. Check for loose cables i n t he pow er subsystem. Also
check for short circuits, for instance if there is a loose
screw causing a short circuit on a circuit board.
3. Remove adapters and disconnect the cables and
power co nnectors to all internal and external devices
until sy s tem is at m ini m um con fig u r ati on require d for
power on (see "Minimum operating requirements" on
page 1 48).
4. Reconnect the AC cord and power on the system. If
the system powers up successfully, replace adapters
and devices one at a time until the problem is isolated.
If system does not power up from minimal configura-
tion, replace FR Us of minimal configuration one at a
time until the problem is isolated.
To use this method it is important to know the minimum con-
figuration required for a system to powe r u p (see page 148).

Recovering BIOS

If the BIOS code in the server has become corrupted, such
as from a power failure during a flash update, you can
recover the B IOS using the Flash ROM Page-Swap Jumper
(J38) and a BIOS flas h di skette.
Note: You can obtain a BIOS flash diskette from one of the
following source s:
• Use the ServerGuide program to make a BIOS
flash diskette.
• Download a BIOS flash diskette from the World
Wide Web. Go to http://www.pc.ibm.com/sup-
port/, select IBM Server Support, and make the
selections for the server.