When you are formatting the PC all the motherboard function are lost. Check first the software if it is already installed. You need to install the motherboard driver so that the sound, video graphics, USB, LAN card and other part of motherboard are functioning, Load you installer CD to the CD room and install. After that it's bring you to restart to take effect and get functioning.
You'll have to reinstall the drivers for your sound. See this tutorial. You can download the drivers from HP, or the mfr. of your sound card. I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread. If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!
drive Analog Device AD1981A Intel 82801DB ICH4 AC 97'' Windows xp home edition, Service pack 3,...
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drive Analog Device AD1981A Intel 82801DB ICH4 AC 97'' Windows xp home edition, Service pack 3, Internet Explorer 7, Intel Pentium 4, 2400 MHz (18x133), Motherboard Chipset Intel Brookdale i845E, Si pueden enviar el link para bajar el sonido de mi pc, mi direccion es gataplateada@hotmail.com