I have many years repairing Canon scanners and here is my suggestion to you.
If you are positive the lock switch is unlocked then I think what happened is the scanner inside the scanner is off its track an can not move. I would remove the glass on the top of your flat bed scanner to gain access to the scanner lens then I would try and move the scanner lens manually with the power off to the scanner. If it does move freely then I would think you have a bad scanner lens. If it doesnt move freely try and reposition the lens back on to its track. They some times jump off there track from shipping.
I hope this helps you out.
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thank you for your comment i will try your suggestion. the other thought that i have is that there is something wrong with the usb cord that connects my mac computer with the scanner. when i attach the usb i also do not get a reading that the scanner is attached. there is nothing wrong with my mac as i use external hardrives and other usb attachments and they all register on the mac - so i am also thinking i may try to buy a new cord and see if that helps
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