Ok, so i'm doing some work in after effect and all of the sudden i get this error message stating something along the lines of "hard drive not recognized".. this is from itunes. then, as my project in ae is rendering i get a similar response. i then have to force quit itunes, final cut and after efects because they're not responding. i then try and put something from the desktop into the trash and i get this ticking noise coming from my hard drive and the circle of **** comes up and the whole computer isn't responding.. that stops and i go to restart.. the same tick re-occurs and im forced to hold down the power button to shut it down. i then boot the system back up and it comes to the grey apple screen and just sits there with the apple logo and the little spin thing underneath. IS this a bad hard drive? nothing like this has ever happened. PLEASE HELP!!