Sparkfun IMU Shield Default Code Not Working

The person in this thread here had a very similar experience and ended up switching to Arduino. I REALLY want to stay with the Photon as I need the easy web connectivity.

I don’t understand how to even test the board. I have a simple digital multimeter but that’s it.

I am powering from a usb port on my macbook laptop.

Are there any tests I can run?

Thanks for any help!

Sam