I have an imac 9 and it's stuck in a loop it'll load and Then a bunch of writing appears on it. I have tried everything that I've read in these forums to get it to boot from a usb where I have a new copy of the operating system and no matter what I've tried it will not do it it will not boot from the USB I'd rather get the computer working than throw it away but I'm at the point where I might throw it away this is a screenshot of what it does and it just keeps going in a loop it gets right to this point and then turns off and back on.