Hello, So I for some reason hit my mac just right to the trackpad. It started making this weird noise, so I hit it soft again, which made the sound go away. I was afraid it was the hard disk that made the sound. But the mac was running perfectly, I could even open apps and files. Then when I was gonna play a movie and it froze. When I started it up again, it took forever to get to the log-in screen. But I was able to log-in. When I logged in everything was so slow. Every app constantly froze. I can't start it normally anymore, it just stays at the white screen. In safe mode though I am able to login, but it is very slow and laggy. Have tried run Disk Utility, but it says the hard disk is fine. Someone suggested I should change the hard drive cable which I did, but it didn't change anything at all. So my question to you is, what is the problem? Is it the hard disk and is there any way I can verify this, as I would rather not have to buy and change the hard drive just to find out it isn't the problem. I have another MBP with a Time Machine backup at an extern, don't know if this can be used to solve/verify the problem? Thanks in advance!