Just got my 2012 iMac 27" with 1TB FD. 1. If I ****** something up, is there a way to get it back to factory settings? How? 2. If I wanna buy Pro Tools, how do I install it since it comes on a CD? 3. I upgraded the RAM myself, how much can I sell the two 4 GB RAMs that came with the machine for? Or should I just bin them?