I have a Kindle 4 with me which has no touch screen. Recently it started giving me errors while loading an eBook on it. So I thought of running the Diagnostic tests on it to see if the things go properly or not. While running the Diagnostic tests, I unknowingly pressed the power button on it which caused the diagnostic tests to get cancelled. Now whenever I try to turn on the Kindle 4, I see a blank screen. Can someone tell why it is happening?