a couple of things for you to check: 1. control panel and to device manager and look for any yellow? on audio, this will tell you that the driver is missing and needs to be reinstalled from CD. 2. check behind PC and make sure the speaker wire is plugged in, they are color coded, so easy to see where they go back into. 3. also on control panel, look for sounds and audio devices, click on this icon and make sure that the mute box is not checked, check the speaker volume button, by clicking it and see where it is set too 4. Hardware tab allows you to click on items and then click troubleshooting button to see it problem can be traced down. ( if you do not have drivers and do not have the CD to reinstall them then use the following instruction to do so:) FINDING DRIVERS GO TO www.driverguide.com JOIN FOR FREE LET THE SITE SCAN SYSTEM THIS TELL YOU WHAT’S ON YOU SYSTEM AND LETS SITE KNOW ALSO SO THEY CAN HELP YOU LOOK FOR THINGS YOU ARE NOW FREE TO SEARCH FOR DRIVERS ONCE YOU FIND THEM, DOWNLOAD TO YOUR DESKTOP FOR YOUR OWN PROTECTION SCAN FILE BEFORE OPENING, THIS IS A GOOD PRACTICE THEN GO TO CONTROL PANEL SYSTEM HARDWARE DEVICE MANAGER RIGHT CLICK ON THE ITEM THAT NEEDS DRIVER AND LET WIZARD INSTALL DRIVER (THIS SITE ALLOWS UP TO 10 FREE DOWNLOADS PER DAY, THE ONLY THING YOU WILL HAVE TO DO IS RATE YOUR FILES THAT YOU FOUND) SMALL PRICE FOR FREE SOFTWARE IF BY CHANCE THEY ARE NOT HERE THAN GO TO http://windrivers.com/VistaDrivers.html