I am trying to install linux, by booting from a USB key.
When I option-boot, an orange icon labelled 'EFI Boot' appears.
When I select it, the activity light on the USB key flashes for about 3-4 minutes then stops. Meanwhile the screen has not changed from the initial 'option boot' screen.
I left it on there for about 20 minutes then ran out of patience and gave up.
This is on an intel mac pro 1,1 .
Has anyone got any idea on how to fix this?