HP ProBook 455 G1 Notebook PC - Manual (Page 45)

1. From the Windows desktop, right-click the Speakers icon in the notification area, at the far right
of the taskbar, and then click Playback devices.
2. On the Playback tab, click either Digital Output or Digital Output Device (HDMI).
3. Click Set Default, and then click OK.
To return audio to the computer speakers, follow these steps:
1. From the Windows desktop, right-click the Speakers icon in the notification area, at the far right
of the taskbar, and then click Playback devices.
2. On the Playback tab, click Speakers.
3. Click Set Default, and then click OK.
Video 35