How do I fix ugly boot screen glitch in Ubuntu 12.04

Normally, the boot screen should says 'ubuntu' with five orange dots below it, but in my pc, they suddenly turn into this:

• Glitched boot screen image
• Glitched boot screen 8 seconds video

Here is my hardware:

• Intel Core2Quad Q9550
• HIS HD 4670 IceQ
• Asus P5Q

How can I fix this?

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