Greetings, HP p6320f desktop, Win 7. No sound, headphones or speakers, disc drive or internet. Have gone into Device manager - Sound video and game controllers - Realtek HIgh Definition Audio - "The device is working properly". When audio is running, if I open up the volume icon in the task bar I can see the level changing (as if the sound is registering). I beleive the sound card is integral to the motherboard on this computer. Any suggestions ? Thx.