Hi Katie, it's a Lenovo Flex 10 and the battery is built in and cannot be removed. If the power light comes on, this is a good thing. Just hope screen is working, then you can try this. Connect the power supply to flex 10, just in case battery is depleted.
First, turn off power button and wait a minute before starting. As soon as you press start button (light comes on), simultaneously press the Fn + F12 key (brightness icon + key). This will boot into the "Boot Manager" setup, but no options can be edited. Use down arrow and select "Windows Boot Manager" and press enter.
With luck, should boot to Windows 8 login screen. Also, you may get a blue popup menu appearing on the screen and asks if you wish to start "Recovery Mode". Select "Yes" and this may also fix problem.