[Windows] Dell XPS 15Z Crash

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http://ubuntuforums.org – Hello everyone, I have a Dell XPS 15Z with Winodws 7 Home Premium installed. However, it seems to have crashed after a blue screen and now when I turn it on it just gives me a black screen with a blinking underscore. I've tried to enter Safe Mode by tapping on F8, but it doesn't work. It used to start up fine before. The problem started when I installed some Windows Updates. Now I don't know what to do. I used Ubuntu's LiveCD to run the Disk Utility and check the hard disk drive and it told me that the drive was bad. I suspect that the hard disk drive has crashed. How can I be sure tho (Hardware)