I have a mid 2009 mbp with a 1 Tb hdd that I think is either suffering from a bad hard drive or bad cable. I upgraded to Yosemite and immediately regreted it... It was taking several minutes for me to open an application and was running really slow. A couple nights ago, I went to boot it up and saw a loading screen with the apple logo and a loading bar. It eventually went to a screen with a no symbol. I cant boot it in safe mode or recovery mode... I got out my disk that came with it and booted from it and attempted to repair the drive. The first time it seemed to work, but then it still wouldn't boot. I tried again and eventually stopped repairing and sat there... I even ran it over night and it didn't finish. Today I attempted to wipe it an having the same result. It doesn't make it very far before it stops moving. This is frustrating because the hard drive isn't but a little over a year old... Is there anything I haven't tried? is it worth buying a new cable in hopes that is my issue?