[ubuntu] Live usb wont boot (usb 3.0)

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http://ubuntuforums.org – I have a Ubuntu live usb .. and have set usb as the first device When I try to boot . all I see is a black screen with a cursor blinking forever. When remove the USB drive . I get a Operating system load error on the black screen and then windows loads. I tried installing Suse Linux . after I was unable to install Ubuntu 12.10 64-bit. Suse Linux had exactly the same fate. Black screen with blinking cursor. 1)Right now my bios is in legacy mode. Also my windows sysinfo32 shows secure boot as unsupported. 2)I am using windows 8 ( though my computer has bios in legacy mode) 3)the usb dri (Hardware)