Samsung LS24F9NSM-ZA - Manual (Page 17)

Installing the Product 2-4
When a PC with a resolution of 1920 x 1080 @ 60 Hz is connected to the [HDMI (DVI) IN] port, you should set the <HDMI>
mode to <DVI PC> in the <Edit Name> of the <Input> mode. In this case, a separate sound connection is required.
2. Connect the [PC/DVI AUDIO IN] port on the rear side of the product to the sound card of the PC.
3. Connect the power adapter to [DC14V] on the rear of the product. Connect the power cord to the adapter and wall socket.
(The input voltage is switched automatically.)