Check the speaker icon on the lower corner of your screen. Make sure you didn't accidentally mute it. Turn the volume up with that control and see what happens.
Definitely try that first.
If that doesn't work, and you've only just updated to Windows 10, it might be a driver issue. Run an update or google your laptop and "windows 10 drivers" to see if you can update them.
Finally, if you have external speakers try using headphones in the jack (or use the speakers on another device) to make sure the speakers are working.