I need an informed and objective opinion. Here are the facts of the case. 1) My friend has a mac laptop that is three to four years old. 2) Two years ago, I was using the laptop. The chord was wrapped around the base of the desk chair, and I accidentally pulled the computer off of the desk. It went crashing to the floor and was dented externally, but fortunately, still worked. 3) The computer worked fine for the following two years. 4) Last week, I was at my friend's house and downloaded a .pdf file for a job application. (my exact actions were to go to craigslist, find a posting, and download the pdf) 5) 5 minutes after I left the computer, my friend went to use it, and it was frozen. 6) The computer was taken to a repair shop, where they said that the hard drive was shot. The cost of replacing the drive was $300, and the cost of recovering lost data is $300. Were my actions responsible for the failure of the hard drive? I have been told that if the hard drive worked for two years after the fall that the fall did not ruin it. I have also been told that if the pdf file that I downloaded contained a virus, it would have ruined the motherboard, and not the hard drive. Any objective and informed information would really helpful. Thank you.