Hello, I have a perfectly working El Capitan installer on flash drive. I know it works because I installed from it on a MAC mini yesterday. I wanted to use it on my PC running Windows 10, a Sony Vaio, in order to install MAC on a an external HDD. But no luck, the flash drive just won't boot. My Vaio just ignores it. The settings on the Vaio are good because I tried another bootable USB flashdrive (Windows 10 installer). What can it be? I don't know much about MAC. Maybe the file system used on the OSX installer flash drive? I prepared it using Yosemite and Diskmaker X.