Today, my computer a Lenovo Yoga 2 laptop running windows 8.1 64-bit, stopped wirking. When I start my computer, it will display the Lenovo boot screen and the rotating dots will rotate a while and then freeze. I've resettet the BIOS but it did not help and I can not take out the battery as it is some kind of built in battery.. My computer does not have a disc drive, just USB. And I dont have made a USB recovery.. Please help me I have all my thesis material on that computer. Thank you.