In regards to connecting a new audio card, what should be done after verifying connections and volume settings?

After verifying connections and volume settings, it is essential to ensure that the sound card is set as the default audio device. This step is crucial because, even if the hardware is properly connected and the volume is adjusted, the operating system must recognize the sound card as the primary source for audio output. If another audio device (such as onboard audio or another sound card) is set as the default, audio signals will not route through the new sound card, resulting in no sound output despite having everything connected correctly.

Verifying the default device ensures that the operating system directs audio playback to the intended hardware, allowing the user to experience sound as expected.