Hello.
I tried downloading the Yosemite install dmg and making a boot usb from it. It shows up as bootable in the system preferences, but won't boot. It starts to boot and then hangs up.
I also watched the video and the usb it makes is not bootable. It doesn't show up in the system preferences.
I read somewhere that the boot file needs to be blessed, but don't have a clue which file this would be.
Can you give me a clue about what is going on here?
Thanks,
Don James
Try a different USB or make an 8GB partition on an internal drive for the installer. The pre parched installer dmg is bootable as is when restored.