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How to Use Error Messages: Use the error
codes displayed on the screen to diagnose failures. If
more than one error code is displayed, begin the diagnosis
with the first error code. The cause of the first error code
can result in false error codes being displayed. If no error
code is displayed, see if the error symptom is listed in the
“Symptom-to-FRU Index” on page 216.
How to Diagnose Multiple FRUs: When the
adapter or device has more than one FRU, the error code
could be caused by either FRU. Before replacing
multi-FRUs, try removing or exchanging each FRU, one by
one in the designated sequence, to see if the symptoms
change.
Passwords: The Passwords are security features that
are used to protect the system and the hard disk data from
unauthorized access. There are three types of passwords
as follows:
Power-on Password (POP)
Hard disk Password (HDP)
Supervisor Password (Privileged Access Password,
PAP)
No overriding is provided. Obtaining permission from the
password owner to unlock the password is a prerequisite
for running diagnostic tests and performing maintenance
service.
See “Password Combinations” on page 230 for more
information about passwords.
How to Disable the Power-On Password:
Important
This information is not available in this HMM online
format. See your IBM Servicer or IBM Authorized
Dealer for this procedure.
Reset Pushbutton: The reset pushbutton resets the
system regardless of the microcode status and forces
power to be powered-off. Use this pushbutton to power-off
when power is not completely off or the microcode is in a
hung state. See “System Board (Top View)” on page 292
for the location of the pushbutton.
Port Replicator Problems: If you suspect a
problem with the Port Replicator, see “Port Replicator
Checkout” in the “Common Devices Checkout” section for
more information.
ThinkPad 355x, 360x, 370C, 750x, 755C, 755Cs
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