I have a 1st gen Mac Mini running a 1.66 intel core duo. After an internal HDD failure, I had no choice but to install the operating system on an external drive I wasn't using connected via Firewire. Installation ran smoothly, and updates ran without a hitch. But for some reason, I have no sound. It's as if sound drivers didn't get installed at all I have searched and searched online, but can't seem to get anywhere. Has anyone had this issue? Attached are some screenshots so you know what we're looking at here.