Hello, I have a 15" Macbook and my friend dropped it from just about 1 feet height and it started to have problem on the display after about 2 weeks, then I went to the Mac city, they charged me about 3k to change the mother board, the problem was solved for the display. But now I am having a start up issue, it stopped at the Apple logo with loading bar, and it turns off after that. I am thinking if it was the hard drive because I stared the checking with Command +R and it sometime says that it's not able to be repaired, sometime it says appear to be OK. So and suggestions to fix this?