Why my MacBook Pro screen got plaid?

Hi

I have a MacBook pro unibody late 2011,once i tried to find somthing in bootcamp windows,my screen got plaid an i was unable to do anything.after i shot down my mac with power key and turn it on again,the screen get even weirder,now there is horizontal lines all over screen.one thing is when i put the installation dvd and going to recovery mode and restart mac.every thing is ok.but when i shut it down and eject dvd,all thing looks same.by the way there is no issues on aht results.is there any one to help?