Please send the following information to [[email@example.com]]:
Which version of Tails are you trying to start?
How did you verify the USB image?
What is the brand and model of your computer?
What exactly happens when trying to start? Report the complete error message that appears on the screen, if any.
What program did you use to install your USB stick?
Does the USB stick start successfully on other computers? If so, what are the brands and models of those computers?
Have you been able to successfully start another version of Tails on this computer before? If so, which version?