Re: Sound/Volume Controls
I would check:
The Basics
Make sure the speakers are on and plugged in to the correct jack. If they're color coded, it'll likely be the green jack.
You can plug the speakers into something else (anything with a headphone jack) to verify they work.
Settings
Double-click the volume (little speaker) or SoundMax icon in the "Notification Area"/System Tray (down by the clock/lower right corner). Make sure nothing is muted or turned down preventing sound.
Driver
Check the sound hardware in the device manager. Right-click My Computer, click manage, and then click Device Manager. Expand the Sound, Video, and Game Controllers container by clicking the "+" next to it. Look for any exclamation points which would indicate a problem with the driver. If the exclamation points are present, reinstalling the driver would be the next step.