This is really agonizing for me. I was on Windows, when my battery ran out of power. It went into suspend mode, or tried to, but it sort of hanged there for well over 3 minutes, doing nothing. Suspend usually takes seconds. So I did a hard shut down, holding down the power button for a few. I rebooted and it shows the typical "GRUB Loading" screen, and hanged there. It did not change. Normally, it would only flash and then show me my OSes. I have a dual-boot of Windows 7 and Ubuntu 12..04. I tried booting into my Ubuntu Live CD and it would not load the desktop. Just goes blank screen on me. I am currently on my BackTrack 5R2 live USB. I tried re-installing GRUB through here and it reported "Installation completed successfully. No errors reported." I rebooted and I got a new error - "Error: File not found". It shows it on TWO lines, blanks out, and stays that way. I am very frustrated. I ran fdisk -l and it shows all of my partitions as normal. I tried grub-update and it acts like it isn't finding any operating systems. I don't understand.