I recently obtained a Dell Inspiron 580s with a ATI Radeon HD 5450 graphics card. This card puts the audio out through the HDMI, I drug my big flat screen from the living room to the office to check this out. My dual monitor setup only has DVI in with an additional audio jack with built in speakers. My onboard audio has probably been disabled when the graphics card driver was loaded. Can I enable my onboard audio to plug in my monitor speakers?