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I used update from Update Manager in Ubuntu 12.04 to update Ubuntu 12.10.

After requirement of reboot, I saw grub was changed and I choose Ubuntu option to go to Ubuntu. But, it shows me that it can't mount to something, press S to Skip and M to do something. It disappeared when I wasn't understanding what it say.

Then, nothing display expect a dash on the top left of a black screen. I held the power button to turn off. Turn on again, try to choose Ubuntu and same mistake. I'm using a Dell vostro 3560 with an ATI graphic card and I'm using Ubuntu and Windows 7 parrallel.

Can you give me some clue to fix this ?

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