This monitor does not have built-in speakers. The online S2421HN/S2721HN/S2421NX/S2721NX User's Guide never mentions "built-in" speakers. Page 10 shows that it has an Audio Line-out port to connect powered external speakers. [IMAGE]
Hi, I just bought Dell monitor S2721HN. I have connected to my laptop using HDMI cable and tried to use built-in monitor speaker, but they are not working. How can I make them work? Thanks 
S2721HN, speakers not working, #2