Recently i had bought a new Compaq Presario sr5110nx laptop. On that i had installed Windows 7 as my operating system. Everything works great except I don't have a audio device on my system. I had even installed a sound card on my system. I get a speaker pop whenever i connect my speakers but nothing happens after that. So, can any body tell me that why is shows no audio device found on Windows 7? Does any body knows about this issue? Please help me out to resolve the above issue. Thanks.