Are we talking about all sound, or the sound from a CD or DVD player. When you go to Start->Control Panel->Sounds and Audio Devices->Sound->Default Beep then click on the little triangle at the bottome, do you hear nothing?
Look in the other tabs for Sound to see if any Mute boxes are checked.
Are the volume sliders in each tab up near the top.
When you go to Start->Control Panel->System->Hardware->Device Manager then scroll down to Sound, Video, and Games Controller, do you see any red or yellow flags alerting you to problems.
Some computers transfer sound down the EIDE cable. Others require a separate small cable from the CD or DVD to a socket on the board. See if you have any of these cables pulled loose by removing and reseating them.
As for sound drivers, you can download a free program called Everest, or another from
www.belarc.com called Belarc Advisor. Either will tell you what your sound card or sound port is, then you can go to the manufacturer's site for that motherboard and download the drivers. Usually the instructions are included. Basically, you just click on the driver to allow it to install. You can use the part number in the center part of the motherboard so you know which board to search for drivers.
If you have bad luck there, do a Google search for the unit you discovered in Everest or Belarc above, then go to that driver site. If all those don't pan out, you can go to
www.driverguide.com and search for free audio drivers... a bit more difficult to install but sound is no big problem.
I guarantee you will find sound drivers. they are everywhere. If you have trouble, send us the part number of the motherboard, or the information you got from the Everest or Belarc site.
