IBM x3250 M3 Problem Determination And Service Manual page 74

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IBM System x3250 M3 Types 4251, 4252, and 4261: Problem Determination and Service Guide
g. Turn on the server. If the server does not start, see "Troubleshooting tables"
on page 57.
h. Check the system-error LED on the operator information panel. If it is
flashing, check the LEDs on the system board (see "System-board LEDs" on
page 18).
i. Check for the following results:
v Successful completion of POST (see "POST" on page 24 for more
information)
v Successful completion of startup