Hi Nichole,
If you are using an iMate Adapter from Griffin Technology (or any other brand of adapter), and want to connect an ADB hardware key to the USB port on a newer Mac OS computer, download and install the adapter's software driver.
Note: The QuarkTech™ team has found that sometimes the adapter transfers insufficient power if it and the hardware key are plugged into any “downstream” device (such as a keyboard, monitor, or USB hub). In such cases, try plugging your adapter with the hardware key directly into one of the USB ports on the computer to find out if it will function in that location.
Hope this Helps,
Regards,
TechLeo
~` Outline Your Ideas `~