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Check the settings for audio volume control on the monitor side. Also, check the individual settings for the audio for applications and system sounds on the OS side. Or call ViewSonic technical support for assistance.
Plug the audio cable from the PC to the audio input jack on the back of the unit. Then make sure audio volume is turned up on the PC side. The monitor also has a volume control setting. Make sure to have a value greater than 1 to hear anything.
I have the same problem in setting up two displays, a Dell as primary and a VA2223wm Viewsonic as secondary, both connected to an Nvidia geforce 9500 GT. I think it might be the cable, but it's baffling. I have one DVI cable that seems to work on either monitor, and either plug on the graphics card. The second DVI cable doesn't seem to work, but when it's connected to the Viewsonic, the Nvidia control panel detects the monitor as secondary, so I can change settings, etc., but the monitor still says no signal. Each monitor works separately when connected with one cable, but not with the other.
There's not much to go on here, but I'll do my best to help. It seems most likely that you turned audio off on your monitor or via your computer's operating system.
If the monitor setting is the problem, you can change it by using the down arrow button on the front of the monitor to scroll through the monitor menu. The fourth item should be Audio Adjust. After highlighting that one, push 2 on the monitor to select that menu item, then press the up arrow on the monitor to increase the volume. When you're happy with the volume, press 1 on the monitor to exit the menu.
If you muted your computer via the operating system, that won't help. If you're using a computer running Windows, look for a speaker icon at the bottom, right of your screen and click it. Slide the volume arrow up to adjust the volume upward.
If those suggestions don't do the trick, please reply with information about your computer, particularly your operating system (e.g. Windows 7, Mac OS 10.5.8 etc.).
You will need an audio cable, cable with mini stereo headphone plug at both ends.
One end will go into the PC Audio line out (Green jack), the other end will go into the monitor audio line input jack (green jack).
Set the volume level on the monitor about 1/2 way up first, the volume control panel on the PC about 1/2 up also (wave, cd, etc 1/2 way also).
Then play some sound and adjust each level as needed.
Buy yourself some stand alone speakers, a base & two side speakers, they cheap these days, base speaker has buit in amplifier & plugs into mains, or get surround sound 5speakers & a base, again mains powered, loud enough to annoy neighbours on full. Built in monitor speakers are renowned feeble tinny sounds. Right click speaker icon, bottom right, on your desktop toolbar, open volume control, ensure volume sliders set to max.
You need to isolate the problem to see if there's a problem with the monitor or with the sound card of the computer.
To isolate this problem, please try the steps below:
1. Make sure that the monitor is properly connected to the computer.
2. Check the volume of the monitor and the volume properties of the computer.
3. Try to connect your monitor into a known working computer.