You plugged in the HDMI cable before plugging in the USB 3.0 cable.Unless you purchased a device with integrated AKG headphones and dual-array microphone, like a Samsung HMD Odyssey headset, HP Reverb, or HP Reverb G2, you'll need headphones with a 3.5-mm audio jack. Make sure you aren't plugging into the HDMI in port! Connect headphones to your headset Identify the HDMI out port on your computer and plug in the headset's HDMI cable. Connect your headset to your PC's HDMI out port
If you don't have enough open USB ports on your PC, you can use an AC-powered external USB 3.0 hub. USB 3.0 ports have SS (Super Speed) written next to them. Identify the USB 3.0 port on your computer and plug in the USB cable. In this article Connect your headset to your PC's USB 3.0 port