Sony computer User Manual

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Make sure the speakers are properly connected and the volume is turned up loud enough to hear sound. 

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Your speakers may not be designed for computer use. 

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If the speakers have a mute button, set the button to off. 

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If the speakers have a volume control, make sure the volume is turned up loud enough to hear sound. 

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If you have connected an audio cable to the Headphones jack, disconnect the cable and use the speaker cable that
was supplied with the speakers. 

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If you are using battery power, make sure the battery(s) is inserted properly and is charged. 

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If the speakers require external power, make sure the speakers are connected to a power source. See the guide
that accompanied the speakers for more information.