I have a Windows 7 / Ubuntu 12.04 dual-boot which I have been using for some time without issue. While booted into Windows, my computer froze (for reasons unknown, just completely locked up 100%), so I did the only thing I could, I turned it off. Since then, My computer does not boot correctly. I no longer see a bios init screen, I no longer see a GRUB menu, I just get a blank screen for about 15 seconds or so, and then the Ubuntu login scree pops up.
I have tried using update-grub to rebuild my grub config to no effect. I am completely at a loss and urgently need a fix for this. Please help D: