Hi all, I recently got my new iMac 21.5' (the skinny one) and have successfully installed OSX onto my SSD drive. Which is connected by a usb 2.0 external caddy, which was all booting fine. Though thats great so went and bought myself a USB 3.0 external caddy. I cant get it to show on boot and only shows up in OSX if I unplug the drive and plug it back in once loaded in. (It shows as USB3 in the system profiler once Ive done so). Any ideas guys. Thanks!