1. Open "Applications" > "Utilities" > "Audio MIDI Setup"
2. Check the properties for "Built In Output". Make sure it's set to 44.1 KHz.
For PC users:
1. Click "Start".
2. Select "Run".
3. Type: sndvol32
4. Click "OK".
5. Make sure the following are not muted and the volume is up for "Volume Control" and "Wave".
If you're still having trouble, check to see if your system meets these requirements for running the video player:
1. Macromedia Flash Player 7.0+ plug-in
2. Windows 2000 or higher with latest updates installed
3. Mac OS X 10.3 or higher
4. Firefox 1.1+, Internet Explorer 5.0+, or Safari 1.0+
5. Broadband connection with 500+ Kbps
Videos on YouTube are streamed through an Adobe Flash player. For the best viewing experience, we suggest you install the latest version of Adobe Flash after removing any old versions you've installed.
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