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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:

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Turning off a working Computer almost always corrupts file system. At the minimum you need to use your Windows repair CD or flash drive to run chkdsk on all NTFS partitions and/or from Ubuntu live installer same version as your install run e2fsck. But if BIOS cannot see drive, you may not be able to do anything and drive is damaged. – oldfred Aug 16 '14 at 4:02
I shut off my computer for about 30 minutes while researching possibilities, went to turn it on to test something, and suddenly it was working normally again... I still have no idea what was wrong with it... – kbjr Aug 16 '14 at 4:11

Please post your default grub file. Post what you see when you type

sudo gedit /etc/default/grub

if grub_timeout is equal to 0, change it to 10.

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And then run 'update-grub' – Jatin Kaushal Aug 16 '14 at 14:49
Yes, I'm aware of that; I already checked the timeout value and tried update-grub, as I mentioned in the original post with no change. – kbjr Aug 16 '14 at 23:34

I turned off my computer for about 30 minutes or so while I was researching possibilities, and when I turned it back on to try something new it was suddenly working fine again. I still have no idea what was wrong with it ... but at least it is working now.

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