I have installed windows 8 Consumer preview on my laptop for testing purpose and since installing it I am not able to turn it off or restart it. When I am clicking on restart or shutdown then screen goes black and stays like that, I can see hard drive light flashing which clearly states that it hasn’t shut off. I have to force it sown to shut down using power button. I did not had any issue in while installing it so I am not able to make out what might be wrong, I wanted to know if there is anything I need to check out rather than reinstalling whole windows 8 again? Any ideas?