IBM RS/6000 44P 270 Service Manual page 110

Step 4
It is possible that another installed adapter is causing the problem. Do the following:
1. Remove all installed adapters except the one the CD-ROM drive is attached to and
the one used for the console.
2. Try to boot the standalone diagnostics again.
3. If you are unable to load standalone diagnostics, go to "Step 5".
4. If standalone diagnostics load, reinstall adapters (and attached devices as
applicable) one at a time and retry the boot operation until the problem recurs. Then
replace the adapter or device that caused the problem. (The system board can also
cause the device or adapter to fail.) Go to "MAP 410: Repair Checkout" in the
RS/6000 and Eserver pSeries Diagnostics Information for Multiple Bus Systems.
Step 5
The CD-ROM drive, SCSI cable, SCSI adapter, graphics adapter, or the system board
is most likely defective. A SCSI terminal attached to the serial port also can be used to
determine if the graphics adapter is causing the problem. This is done by removing the
graphics adapter, attaching an SCSI terminal to the serial port, and retrying standalone
diagnostics. If the standalone diagnostics load, replace the graphics adapter.
1. Replace the CD-ROM drive.
2. Replace the SCSI cable.
3. If the CD-ROM drive is attached to a SCSI adapter rather than the integrated SCSI
on the system board, replace the SCSI adapter.
4. Replace the system board.
5. If you replaced the indicated FRUs or performed an action and the problem is still
not corrected, or the above descriptions did not address your particular situation, go
to "MAP 1540: Minimum Configuration" on page 50.
6. Go to "MAP 410: Repair Checkout" in RS/6000 and Eserver pSeries Diagnostics
Information for Multiple Bus Systems.
92
Service Guide
6) If standalone diagnostics load, one of the disconnected devices is causing
the problem. Reconnect the devices one at a time and retry the boot
operation until the problem recurs and replace the device that caused the
problem. (If the problem appears to be one of the disk drives in the disk
drive cage, be aware it could be either the disk drive or the backplane.) Go
to "MAP 410: Repair Checkout" in the RS/6000 and Eserver pSeries
Diagnostics Information for Multiple Bus Systems.