When you cannot hear sound from a new IDE DVD drive, what should you connect?

Connecting the audio port on the DVD drive to the audio input on the sound card is essential for enabling sound playback from the DVDs. Most internal IDE DVD drives include an audio output that requires a physical connection to the sound card for sound to be transmitted. If this connection is not made, even if the drive operates correctly, you may not hear any sound during playback, as the audio data from the DVD cannot reach the sound system.

The other options do not specifically address the issue of sound output. The video port to the monitor is not applicable since DVD drives do not typically output video directly; they will send video data through the computer's graphics system when playing a DVD. The USB connection to the motherboard is relevant for external drives but does not pertain specifically to sound issues with internal IDE drives. Lastly, while the power supply is necessary for the drive to function, it does not relate to the audio output, which requires the dedicated audio connection to the sound card.