I've just installed Raspbian to my new RPi2 B+. Shutdown and connect Adafruit Neopixel Ring (3 connectors: 4th pin - 5v, 6th pin - GND, 12th pin - DATA IN) and boot the RPi. Then it has reset itself and hasn't booted anymore. Red pwr led lights faint, and the green just a bit. Power supply is 5V, 2A.
Edit: After all found the recommendations to not supply Neopixels by the 5V rpi's output. The question is - is it possible to recover RPI or better throw to trash?