I have the Intuos (GD) and I've followed all of these suggestions and still nothing has worked.
I found this: It DID NOT fix my problem but it may fix yours. I still have no tablet.
I am running a Macbook Pro with OSX.5.2
I have a Bamboo Fun, medium sized, CTE-650
The most current driver (as of today) is Wacom Driver 5.0.5-3
I previously had a Graphire tablet and upgraded to the Bamboo. I
installed off the CD and everything was running great. I used System
Update last week and installed everything on the list (why not?).
Suddenly the Wacom driver refused to recognize my tablet.
"A USB Tablet was not found when the system started"
I did everything else I could find described as a solution for this
problem:
-Reboot
-Uninstall Driver, Reinstall Driver
-Repair Disk Permissions
-Uninstall Driver, Repair Disk Permissions, Reinstall Driver, Reboot
None of these solutions worked for me. What I found was that there
was an old version of some Wacom preferences in the directory,
~Users/*username/Library/Preferences/
These files were entitled,
com.wacom.pentablet.p.TMP
com.wacom.pentablet.prefs
com.wacom.tabletpreferences
com.wacom.wacomtablet.prefs
The uninstaller was neglecting to delete these files, and the
installer was not finding, erasing or overwriting them. I deleted
them all, reinstalled the driver and rebooted. Problem fixed.