Microsoft Silverlight Video Will Not Play

I was attempting to watch a video on SharePoint 2010 PerformancePoint Services and couldn't get the video to play on any browsers, IE, Firefox, Chrome, or Opera. In my case the problem was caused by the sound settings on my laptop, which I discovered by trying to play a Flash video on YouTube. The Flash videos played but there was no sound. Changing my sound settings in the Control Panel fixed the problem and the Silverlight videos played. It's odd that a bad sound setting causes the Silverlight videos to not play at all.