No sound is output from either your computer or the USB DAC AMPLIFIER.

Check the sound volume or muting settings as follows.

For Windows (Windows 7 is used as an example)

1. Select Start - Control Panel - Hardware and Sound - Manage audio devices.
2. When the Sound window is displayed, select the Playback tab, and then select.
3. When the Properties window is displayed, open the Levels tab to check the volume level.

For Mac (Mac OS X is used as an example)

1. Select the Apple menu, select System preferences - Sound, and then select the Output tab.
2. Select Sony USB DAC Amplifier from the Select a device for sound output list.
3. If the Mute check box has a check mark in it, remove the check mark.