Power Computing PowerTower Pro User Manual page 240

Drive Problems
Symptom: The drive doesn't spin up and the LEDs don't light up.
Cause: No power or a blown fuse.
Solution: Check the power cable. Make sure the outlet is active. Check the drive's fuse.
If it is burnt, replace it with a fuse having the same specifications. Make sure the fuse is
the fast-blow type. If the problem continues or the fuses repeatedly blow, you may have a
power supply problem; contact technical support of your drive's manufacturer.
Symptom: Multiple icons appear on the Desktop for the same drive. If you have parti-
tioned your drive, there should be a separate icon for each partition that is mounted, but
no more.
Cause: SCSI ID conflict, usually drive is set to ID 7 or extension.
Solution: Make sure that no two SCSI devices share the same SCSI-ID, and that the ID
numbers range between zero and six (seven is reserved for the Macintosh). Make sure
cabling and termination are OK.
Symptom: The drive does not mount.
Cause: There are many software or hardware possibilities.
Solution: Make sure your drive is properly connected to the Macintosh and properly
terminated. Check the SCSI ID of the drive as well as any other devices on the SCSI bus.
Use Primer to test the media and update the driver.
Symptom: The drive starts to mount, but then crashes. This could have many causes. We
explore possible Causes and appropriate Solutions below.
Cause: The hard disk's System Folder or the SCSI drivers may have been corrupted by a
system crash or virus.
Solution: Replace the System Folder on the hard disk first by booting initially off a floppy
disk and reinstalling using the Installer. If after the reinstalling the System Folder, the
problem persists, use the Primer to update the drivers on the hard disk.
Cause: Multiple System Folders on the drive.
Solution: Make sure you have only one System and Finder pair on your drive. Find any
extra ones using Find File, and delete them. If you try to remove an active System/Finder,
you will get an error indicating it is in use. Remove all inactive System and Finder files.
Cause: The Desktop file may be corrupt.
Solution: Rebuild the invisible Desktop file; hold down the Command (Open Apple key)
and Option keys while the computer is starting-up; a dialog box will ask you
if
you want
Hard Disk ToolKit.Personal Edition User Guide 213