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Troubleshooting Symptom Charts/Peripherals - 31
I/O devices are
unrecognized, or
garbage is
transmitted or
received
1 Reset PRAM. (See Power Manager and PRAM Reset in
Additional Procedures.)
2 Check cables.
3 Verify that SCSI device is correctly terminated.
4 Verify that SCSI select switch setting on external device is
unique.
5 Test device with known-good computer.
6 Replace logic board.
In disk mode,
computer does not
display SCSI icon
until host is booted,
or computer crashes
when host is shut
down
1 Verify that computer has a unique SCSI ID.
2 Check that SCSI disk mode cable is good and that connection is
tight.
3 Replace logic board.