hi I have exactly the same patterns on my screen like that for around 3 weeks. In the first few days I just try to adjust the screen lid by close/open it up until it show the desktop again. However, it completely looks like pointo's screen now. The only way I can use it by pluging to the external screen. Except for the screen, everything work just fine with the external display.
I brought to Apple store and they said it cost £260 to repair (they said they will replace the screen). But this macbook pro bought in Dec 2009 and it's not gonna live long so £260 is not worth it.
Could anyone have any advice for us to repair this issue with minimal cost?