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I am using Ubuntu 12.04 x64 desktop edition. Previously it works fine, but just now I found that there is a while screen with some black dots when I log off. Then I found that all the grub, tty, and even ubuntu startup screen is not functioning properly. I tried to re-install lightdm, but it does not work.

The linux kernel is 3.2.0-23. I am using an AMD graphic card. The x display is working fine.

The grub. Previously the font was much smaller and the background was purple

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The start screen. It should be purple in the background, ubuntu in the middle with five dots below. Now I think the blocks in the middle is "ubuntu"?

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all tty are like this. Now I cannot read the words!

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Please advise on how to solve the problem. Thank you!

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