Apple Macintosh PowerBook 190 Series - Manual (Page 110)

SCSI equipment and SCSI disk mode
External SCSI equipment doesn’t work, or a hard disk icon does not appear on the
desktop.
m Check that all cables are connected securely, that the devices are plugged
into working outlets, and that the devices are turned on.
IMPORTANT Make sure that all equipment is turned off before connecting or
disconnecting cables.
m Make sure that you turn on SCSI equipment before you start up the
PowerBook.
m Check that each connected SCSI device has a unique ID number
between 1 and 6.
m Make sure that SCSI cable terminators are correctly positioned. Follow the
instructions in “Connecting SCSI Devices” in Chapter 4.
I can’t turn on the computer after connecting a SCSI device.
m Turn on the SCSI equipment first, and then turn on the computer.
When I start up using SCSI disk mode, the desktop appears.
m You may not be able to use your PowerBook in SCSI disk mode with
password protection turned on. Turn password protection off in the
Password Security control panel.
m When you use SCSI disk mode, the computer should display an icon with a
number in it.
If the computer starts up normally, immediately press the Power key to shut
down (if you can) or turn off the computer. If you don’t, you might damage
your information or equipment.
103 Tips and Troubleshooting