I have a buddys computer that's a computer HP Pavilion 532w is the model of it...I did a reformat and now there is audio.Says there is no mixer device.I did few things that i found on google to try and fix it but none of them worked.I went in control panel add hardware and all of that but none of it worked.This is the second time me reformatting it and the first time it worked like a charm but this time it's not been so good. How can i fix this ?