Funny, my sister-in-law has had every version of the Kindle made and she is always able to power them off to a blank screen. My Nook Simple Touch has a 100 hour battery life. When you turn it off, you get a screen that says "this device if off" and that screen blanks out a minute or so later. BTW, your story is changing. From seeing the book being okay to it being a screen saver. And the screen saver is a standby mode, not off.
But I understand, you have the super doper technologically enhanced perpetual Kindle where it would cause a melt down of the micro-reactor core leading to the pile burning a hole through the bottom of your Kindle, through the plane and to the center of the earth if you took all power away. So please don't do that no matter what the FA ask or the FARs require.
