You really need to have a look at the UC100 doccumentation to see how it needs to be set up.
It sounds like the UC100 is not communicating correctly or possibly you do not have the ports and pins set correctly.
As mentioned I have never used the UC100 so I am not familiar with its setup. It could even be there is a breakout board connected to the UC100 that then connects to your drives etc, possibly that needs powered and currently it is not.
Hood