USB scanner no longer recognized by MacBook

I have a Fujitsu ScanSnap 1500M which worked wonderfully until very recently. The scanner itself appears to still work but my MB does not recognize it.
The problem started after I made a couple of changes to my setup:
(1) I switched computers with my wife, migrating accounts between the two laptops
(2) I installed a Magic Trackpad (performs poorly with bluetooth connection constantly failing)
(3) I installed Office 2011 for Mac
(4) I upgraded OS X to 10.6.5 (the scanner may have worked after this update - I don't remember exactly).
THE PROBLEM:
The scanner thinks it is connected (the blue light comes on when I plug in the USB cable) but the MB doesn't "see" the scanner. When I go to the USB device tree in >> About This Mac >> More Info... the scanner doesn't show up.
WHAT I'VE DONE SO FAR:
- checked USB cables, rebooted etc
- updated ScanSnap Manager to the latest version
- reset PRAM to defaults
- created a new test user account
None of the above has made any difference. The scanner still doesn't work.
Any ideas?
Thanks

You may get more specific help in the Notebooks section https://discussions.apple.com/community/notebooks/macbook_pro
This area is for the Mac Pro (desktop).

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USB scanner no longer recognized by MacBook

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