Hello, today my bag with macbook (middle 2007) fell down. When I tried to power it on, it didn't work. There was no startup chime, but power controller was lighting. There was nothing on a display, it only flashed for a second but then nothing.. Apple on the backside doesn't lights. Then I connected it to an external display but it only said "no signal" or something else. I also tried to do this: http://support.apple.com/kb/HT3964 but it didn't help. Thank you for everything that can help me. I really need to fix my Macbook.