Check headphones or speakers are not plugged into the output plug for the sound card and if they are they are powered on.
Go to Start>Control Panel> Sounds and Audio Devices>Adjust the system volume and make sure the volume is up and Mute is unchecked.
If you are using a laptop, or a computer with a keyboard with volume controls, make sure these are not muted or down low. Check your user manual for exactly how to use this if you are unsure.
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