Why is my computer not recognizing my speakers?

Check power and connections

Make sure the speaker power cord is plugged in and power is getting to the speaker.
Check audio settings

Make sure the audio settings are set to the correct input and output device.
Troubleshoot the device

If the issue persists after taking the steps above, you may need to restart the device or run a troubleshoot if supported.
Update audio drivers

If the issue still exists, update the audio drivers on the system to ensure that they are up-to-date.