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I am very well versed in Canon scanners with many years of experience on them so I hope my advice helps you out. With any canon scanner that uses SCSI only 3 things can go wrong with them. First I would check the SCSI cable so see if the the connecting heads have pulled away from the cable and the tiny wires are exposed. If so one of the wires may be broken. Or possibly a bent pin on the connector. A simple test would be to replace the cable with a good working one. Then try the scanner to see if it will scan.
Second, the SCSI card itself, on boot up while your still in the boot screen you should see something like ADAPTEC SCSI and then some numbers. Or something similar depending on the manufacturer of your SCSI card. That particular scanner uses SCSI II. If you dont see the prompt window on boot up then I would go to item 3 below.
The last thing to try is item 3 and you will need to go into control panel in windows to do that. In control panel I would look device manager and then imaging. Under imaging if you have a yellow question mark your system does not recognize the scanner as being connected to the computer. If you verified that items one and two above are good and functioning correctly then I would disconnect the scanner via the scsi cable from the computer and reload the drivers for the scanner and then rehook up the scsi cable and reboot the computer. Then I would go back to control panel/device manager/imaging to see if the computer now sees the scanner if it does then you are able to scan again. If it does not, and you have confirmed that the SCSI cable and card in the computer are good and working and the drivers are installed correctly. Then it would be safe to say the SCSI port on the scanner is faulty. The scanner will need to be repaired then by a Canon technican.
You need a Firewire/ SCSI adapter. Mine is a Belkin F5U541. Then simply connect a SCSI cable from the scanner to the adapter & a Firewire cable from the adapter to your Mac. I'm using my old Umax Astra 2400S w/ a G5 iMac running OSX 10.6.7. I had to upgrade my old copy of VueScan, however, to run on Snow Leopard
If your macbook doesn't have the correct SCSI card (SCSI II - d-sub mini 50 pin x2 connector) installed, you aren't going to be able to do this. You will need to find this SCSI card and install it in a computer that will accept it.
SCSI devices are detected as the computer is booting. If your scanner was powered on after your computer was already up and running, it may not have been identified by the SCSI card. Try leavinging the scanner connected and powered on and then reboot your computer. Also, the pins on the SCSI cable connectors are easy to bend; inspect the rows of small pins with a flashlight or just try a different cable if you have one.