Hi all please need help on this. May sound simple but not sure. I have a mac mini that i mistakenly deleted the Mac operating system. Now i have only windows installed. The problem is my speaker icon is gone. When i try to bring it on, i get this error message below: No active mixer devices available. To install mixer devices, go to control panel click printers and other Hardware, and then click hardware. I tried installing some audio drivers but still no solutions. I appreciate all replies Thanks.