6 months ago my macbook suffered hdd failure after the dreaded flashing question mark...i got it replaced and all's been fine until two days ago when everything froze and i couldnt force quit any of the applications. I finally managed to turn it off and left it for a few hours. It worked fine yesterday, but today on start up the image of a harddrive appeared, with the words 'hard drive' and an arrow....i recall this happening a short while before I got the flashing folder with the question mark when the hdd failure happened... It appears another hdd failure is on the horizon. Does anyone know if there's anything i can do, or is it already too late? Help!