First, check if the spectrometer is powered by USB or externally.

Is the spectrometer powered by USB, then check if the green LED is ON at the front.
Make sure the PC sound is ON. When you connect the spectrometer, you should hear a sound.

If the board is externally powered, check the 12V adapter. Check the voltage of the main source.
The power switch at the back of the spectrometer must be switched to external power state, then check if the green LED at the front of the board is on .

If the green LED won't turn on, install the driver and check again.