Ok so whenever i boot from a live usb it keeps pausing on the part where it says ISOLINUX blah blah Peter Anvin.(It's on a vblack background with grey writing) I can't quote exactly because i'm at school. But can someone tell me why this doesn't work? I know how to boot from usb. I put my usb at the top of boot list and all. I have used many different live usb creators. Any help?

PS: This isn't just with ubuntu. It has done this with : Fedora, Easy Peasy, Puppy, Macpup, Arch linux and ClearOS. ( I have heaps of linux ISO's on my pc )

Thanks in advance.