Audio Problems

I have this Gateway Laptop with windows XP. I have a weird audio problem. No sounds except error sounds and REALLY basic computer sounds work but YouTube, videogames,ect. Don't have ANY audio. I tried my headphones and with my luck it don't work. I went under control panel and clicked sounds and audio devices and it's ALL grayed out. I cant click anything. I go under search and click All Files and Folders on the left and search volume. I click Volume Control and it says There are no Active Devices Available. if u need any other info plzzzz tell me. I really need help. Thx and yah bai. :)