PURPOSE:
Check that external line out connection works correctly
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STEPS:
1. Insert cable to speakers (with built-in amplifiers) on the line out port
2. Open system sound preferences, 'Output' tab, select 'Line-out' on the connector list. Click the Test button
3. On the system sound preferences, select 'Internal Audio' on the device list and click 'Test Speakers' to check left and right channel
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VERIFICATION:
1. Do you hear a sound in the speakers? The internal speakers should *not* be muted automatically
2. Do you hear the sound coming out on the corresponding channel?