I recently picked up a new (to me) mini. I wiped the HDD and I'm trying to install Yosemite using Internet Recovery but the only option I'm given is to install Lion. Do I need to do that then go through the update to Yosemite? Also, for some reason, there's no sound coming from it. I"m not sure why yet but I'm not hearing the boot chime, so maybe I'm missing something.