Please ensure that phantom power is powered off before connecting or disconnecting the microphone. 

ProCast Connecting Instructions Part 1

1. Use an XLR cable to connect the microphone's output to a balanced XLR input with phantom power.
ProCast Connecting Instructions Part 2

2. Switch the XLR input's phantom power on. Phantom power is required for the HyperX ProCast to function. This can be provided by the audio input device or a separate in-line power supply. 

If you are unsure how to toggle phantom power on your audio input device or in-line power supply, please consult their respective product manuals.