Re: hi am new around here
Fabian, welcome to CF.
It looks like the USB cable is only used to provide power to the mic. The Aux cable must be plugged into a mic input on your computer for it to work. Ensure that the Aux cable is indeed connected to an mic input, rather than line-in or some other. If both cables are plugged in and it's not being detected, it is likely an issue with your computer's audio driver.
Go to Control Panel, click on "Sound," then the "Recording" tab. does your mic show up here?