My MacBook Pro 2010 was doing a wonderful job of identifing faces in i photo. Unfortunately, i photo froze, and the internet had a hard time connecting though airport. I attempted to shut down programs. They wouldnt, so I held the power button down and crashed the machine. Now when I restart it I get the blue screen. I tried everything I could find on the internet to fix it...nothing works. I did run a diagnostic check, hardware and software are fine. I'm so upset! this machine has NEVER given me a problem...