I cant get sound on my viewsonic va520

You need to add some information - what is the source for the video that you are viewing on the VA520? The VA520 has no speakers in it. If it is a desktop computer, look on the back of the computer for a green 3.5 mm stereo audio port. This is your speaker out connection. Plug in any set of computer speakers or headphones. (Computer speakers may require a USB connection or to be plugged into an AC outlet to power the speakers.) You can find cheap speakers for under $20; good speakers will be more expensive. With a laptop or some desktops, you'll find a headphone jack on the front of the computer. (This will be labeled with a small picture of a set of headphones.) The headphone jack is also a 3.5 mm stereo port.

I hope this helps.

Cindy Wells
(laptops usually have internal speakers; most desktops do not have any internal speaker anymore. If you have headphones with RCA audio plugs, you can use a RCA F/F to 3.5 mm M audio adapter to use them with the computer. A stereo system may not work with a computer.)