IBM H Series Installation And Service Manual page 174

Check network cabling to adapter.
3. Try to boot and run standalone diagnostics against the system, particularly
against the intended boot device.
Turn the power on.
Insert the diagnostic CD-ROM into the CD-ROM drive, if you cannot insert
the diagnostic CD-ROM:
a. Replace CD-ROM drive.
b. Replace power distribution board.
c. Replace I/O board.(See notes on 3-1.)
If the intended boot device is not listed in the "NEW RESOURCE" list go to
"MAP 0290: Missing Resource Problem Resolution" in the Diagnostic Infor-
mation for Multiple Bus Systems.
If a SRN, not an 8-digit error code, is reported, go to the Diagnostic Informa-
tion For Multiple Bus Systems manual.
If the diagnostics are successful, it may be necessary to perform an oper-
ating system specific recovery process, or reinstall the operating system.
If unable to load standalone diagnostics:
a. Verify proper SCSI bus termination.
b. Check SCSI cabling (signal and power cables).
c. It is possible that another attached SCSI device is causing the problem
– Disconnect the signal and power cables from the hot-swap bay back-
planes.
– Disconnect the disk drives in the hot-swap bay from the backplane.
– Disconnect the signal and power cables from any other SCSI devices
attached to the SCSI adapter that the CD-ROM drive is attached to.
– Try to boot the standalone diagnostics again.
– If unable to load standalone diagnostics, go to step 4 on page 3-67.
– 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 hot-swap bay be aware it could be either the disk
drive, the backplane, or the power distribution board). Go to "MAP
0410: Repair Checkout" in the Diagnostic Information for Multiple Bus
Systems.
3-66
RS/6000 Enterprise Server Model H Series Installation and Service Guide