2010 Macbook Pro running Snow Leopard. One day a few weeks ago, I dropped it -- short distance, but alas, hard surface. It performed totally normally for a few hours, then it started freezing for a while, coming back to life for a second, then freezing again. I turned it off to reboot it. Since then, I turn it on, it displays the white screen, then the apple logo, then sticks on the blue screen indefinitely. I can’t boot to safe mode or recovery mode (edit: apparently there's no recovery mode in 10.6.8, anyway), nor can I boot from the OSX DVD. I can, however, boot to single-user mode. fsck found a few minor errors and claimed to repair them. I was able to retrieve everything that wasn’t already backed up. Want more evidence that it’s not a hard drive failure? I put in a new SSD and I’ve still got the same problem. The DVD drive appears to be readable as well. The Apple Hardware Test on the DVD ran and said everything was fine. USB storage is readable and writable -- that’s how I retrieved my data. I just can’t boot. Any idea what component is to blame here?