Screen problem : black/green then white then vertical lines

Hi, I have some problem with my MacBook.

When I'm turn on the MacBook, the screen become black/green (http://yfrog.com/j1img6030bj)

Few seconds later the screen become white (http://yfrog.com/0mimg6029xj)

Finaly when the MacBook finished to boot on OS X or on the DVD install, the screen displays vertical lines (http://yfrog.com/j8img6033cj)

I tried to connect the MacBook with an external screen, and it works fine, I can see the OS X wallpaper.

Thanks for your help.

PS : I forgot to say that I already had this probleme one month ago, and I managed to temporarily fix it by moving the screen.

Thanks.