Why won't my speakers work on my computer?

For some odd reason my computer won't register my speakers. The volume control says they are plugged in, but when I try to play music or watch videos no sound plays. I know it isn't my speakers that are broken, because I've plugged them into my laptop and my iPhone.

Have you tried to update its drivers. Sometimes windows can't find the appropriate drivers on the internet and you have to install them manually.
Right click on "My Computer" and go to "Device Manager".
Then find your speakers on the "Sound, video and game controllers"
Then click update.

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