Please check this
- usb cable ok? Do you have some other mini-USB cable to try?
- sd card fully inserted? See pictures at http://jevois.org/start/start.html
- usb port ok? Try to plug in some other device like an external hdd, is it working? Try to plug JeVois into a different computer, still no led?
Otherwise, maybe your camera received some physical damage. Please email us at email@example.com with your order information and we will help you with getting a replacement.