Sounds simple but the speaker connections are firmly pushed in?
Volume up to max?
Click the speaker icon in the system tray (bottom right). If that is not therem then...
Start > Control panel > > Under "Device Volume" > Make sure "mute" is not ticked.
Then click the first "Advanced" > Make sure nothing is muted there...
Then with that window click "Advanced" > Make sure "1 Digital output only" is ticked or not ticked depending upon your speakers.
Now go back to "Sound and audio devices" > Click the Second "Advance" Choose the speaker setup.