The 2013 edition of the Kindle Fire HD 7" tablet by Amazon. A budget edition of the new Kindle line, with a lower screen resolution than the HDX, and lacking the 2012's camera. Released October 2, 2013.
It turns on and says Kindle fire then shuts back off.
If the screen is turning on and properly showing an image. The operating system could have crashed and is causing it to power cycle when turning on.