Startup screen blinking lights??

Hello everyone. So let me tell you the activities of my laptop yesterday. I was using it last night for emails and such and then set it on my dresser so i could go down stairs. It had fallen off so. I picked it back up and started using it again everything was fine and once I was done I set it on my nightstand off charger and went to bed. This morning I try to turn it on and it blinks colors.. kind of like a slideshow. Gray then red the green then like gray texture screen. Over and over until it goes to sleep. How can I fix it? If I need to open it how. Do I do that? I have a Mac os x snow leopard