Does not finish booting from USB

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http://askubuntu.com – While following the instructions here (either 2.10 or 2.04): http://www.ubuntu.com/download/help/create-a-usb-stick-on-windows It begins good. Brings up the selection menu to boot from USB or to instal. Then starts booting fine but never finishes. It gets stuck on the purple screen with the ubuntu logo. The progress dots freeze. If I leave it, after a while, the screen gets mangled with random boxes as if the graphics card is going bad. This is on a Asus G51J ... should I assume there is some type of a driver issue ? (HowTos)