I have a Dell Inspiron E1505, i already tried everything to try and fix this but nothing works. The speakers are built in, they used to work before i installed windows XP professional. But now they don't work, i tried videos on youtube, i installed realtek audio 3 times and nothing. But in Device manager under "sound, video and game controllers it has a yellow exclamation mark next to "IDT high definition audio codec". Does anyone know how to fix this? Please HELP??