Booting Ubuntu from a USB stick

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http://askubuntu.com – I have tried to boot from a USB drive using three different programs, LinuxLive USB creator, Universal USB creator, and UNetBootin. I am using a Dell Latitude E5410 running Windows 7 and am trying to install Ubuntu 12.04. Each time I select boot from USB device, I get to a menu with options to try Ubuntu without installing, boot into Ubuntu, and install on Hard Disk. No matter which option I choose my screen goes to a not-quite-black color and nothing happens. I have to disconnect my laptop from its power source to restart it. I was wondering if there might be a problem with my USB stick(San (HowTos)