IBM pSeries 670 Service Manual page 138

Symptom
The system does not respond to the password being
entered or the system login prompt is displayed when
booting in service mode.
No codes are displayed on the operator panel within a
few seconds of turning on the system. The operator panel
is blank before the system is powered on.
The SMS configuration list or boot sequence selection
menu shows more SCSI devices attached to a
controller/adapter than are actually attached.
118 Eserver pSeries 670 Service Guide
Action
1. If the password is being entered from the Hardware
Management Console (HMC), go to the IBM
Hardware Management Console for pSeries
Maintenance Guide.
2. If the password is being entered from a keyboard
attached to the system, then the keyboard or its
controller may be faulty. In this case, replace these
parts in the following order:
a. Keyboard cable
b. Keyboard
c. USB card the keyboard is attached to.
3. If the password is being entered from an ASCII
terminal, then use the problem determination
procedures for the ASCII terminal. Make sure the
ASCII terminal is connected to S1.
If the problem persists, replace the primary I/O book.
Reseat the operator panel cable. If the problem is not
resolved, replace in the following order:
1. Operator panel assembly. Swap the VPD module from
the old operator panel to the new operator panel.
2. Primary I/O book. (See notes on page 111.)
A device may be set to use the same SCSI bus ID as the
control adapter. Note the ID being used by the
controller/adapter (this can be checked and/or changed
through an SMS utility), and verify that no device
attached to the controller is set to use that ID.
If settings do not appear to be in conflict:
1. Go to "MAP 1542: I/O Problem Isolation" on page 261
2. Replace the SCSI cable.
3. Replace the device.
4. Replace the SCSI adapter
Note: In a "twin-tailed" configuration where there is more
than one initiator device (normally another system)
attached to the SCSI bus, it may be necessary to use
SMS utilities to change the ID of the SCSI controller or
adapter.