Hello, I bought a new iMac a few days ago. It has Mountain Lion pre-installed and it doesn't support my external sound card, a Presonus Firebox. I tried to install Lion and even Snow Leopard on a different partition to be able to use the sound card but it doesn't seem to work.... Does anybody know if it's possible to install an older version of Mac OS X? And how to do it? I'm not thinking about buying a new sound card just yet.