[ubuntu] Ubuntu crash... Wont BOOT!!! ;(

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http://ubuntuforums.org – I have a Dell Inspiron dual-booting ubuntu 12.10 and Windows 7. So yesterday I was derping around on ubuntu and decided to shut it down. Upon turning it back on, I was greeted with the normal dual-boot menu. I scrolled down until ubuntu was selected then I pressed enter to boot it, but the only thing that came up was a command line that says "Grub." Please note that I am an absolute noob so I dont know anything about this. PLEASE SOMEONE HELP MEEEEE. ;/ (Hardware)