IBM 7026-H80 - RS/6000 - 256 MB RAM Service Manual page 179

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 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 primary I/O drawer
backplane 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 primary I/O
drawer backplane is most likely defective. A TTY 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 a TTY 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 primary I/O drawer backplane, replace the SCSI adapter.
4. Replace the primary I/O drawer backplane.
5. If you replaced the indicated FRUs 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 113.
6. Go to "MAP 410: Repair Checkout" in RS/6000 and Eserver pSeries Diagnostics
Information for Multiple Bus Systems .
161
Chapter 4. Checkpoints