My PC sound was working perfectly fine before my system crashed but after I reinstalled XP Pro the entire PC sound is off, I tried checking under control panel etc... but I can't access any help or get it back to functionality... Please Help

Reinstall the sound drivers that originally came with your PC. That should fix the problem.

Like twinkledooter suggested -- get the Make and Model of your Sound Card

Google it to find drivers -- Example: Creative Sound Blaster AudioPCI - driver

Download -- This should give you site to download fresh set of drivers

Install and enjoy your sound

Make sure the on-board sound chip is enabled in BIOS. At chipset section it should be.