DVI interface could only transfer video. Please use a separate cable from computer/laptop headphone port to transmit audio.

To set up completely , you have to adjust setting in 'Displays'.

To set the display:
1.With your display monitor connected to your Mac, open Apple -> System Preferences.
2.Select 'Displays' with its big blue screen icon
3. Go under 'Arrangement' section
4. Check the Mirror Displays checkbox

To set up completely, you have to adjust setting in 'Screen'.
To set screen:
1. Right-click any empty area of your desktop, and then click Screen resolution
2. Click the multiple displays drop-down list, and then select 'Duplicate these displays'.
3. If the display monitor is not listed, click 'Detect'.