I have an iMac 10.1. I tried to install Windows through Boot Camp. I messed it up and ended up wiping my hard drive installing Ubuntu, reformatting it again and I still can’t boot into Mac OS. I’ve been using System Rescue CD from USB as I don’t have a CD drive. I also can’t use the Mac install disc. I’ve been trying to mount the second hard dive that was working. Have had no luck. Any ideas?