Apple Mac 8600 - Manual (Page 79)

Troubleshooting Symptom Charts/Hard Drive - 16
Hard Drive
Single internal hard
drive does not
operate; drive
doesn’t spin
1 Replace hard drive power cable.
2 Replace hard drive. If problem resolved, reinstall SCSI
device driver and system software.
3 Replace power supply.
No internal SCSI
drives operate (PM
8600/9600) or no
internal SCSI devices
on a single bus
operate (WS 9650)
1 Verify there are no duplicate SCSI device addresses on a
single SCSI bus. (Refer to Basics chapter for detailed
explanation of SCSI IDs used in WS 9650.)
2 Disconnect external SCSI devices and check for proper
termination. Only last device in SCSI chain should be
terminated.
3 Check internal SCSI devices for proper termination. In PM
8600 or 9600, last connector on Fast SCSI-2 cable attaches
to rear internal hard drive, which is terminated. In WS
9650, Fast SCSI-2 cable should have terminator on last
connector or last connector should be attached to terminated