I recently got the Sound Blaster Tactic 3D Alpha headset for Christmas and tried them out. I plugged in the USB thing that came with it, which allowed you to plug the headphones and mic into a USB port, and it installed the device fine. Right now I have to send them back because of a problem with the headset. But when I unplugged the USB I noticed that I have no speaker in playback devices. And when I plug in my older headphones into the front of the computer they don't appear in the playback devices. I tried checking "Show disabled devices" and "Show disconnected devices" but all I get are four Digital Audio (HDMI) devices. The same thing shows up in Device Manager.
I could use my headphones but only when the Sound Blaster USB thing was plugged in. I have Realtek High Definition Audio but now it doesn't show up in Device Manager. Also, my speakers are built into my monitor.