Hi my hard drive has died on my iMac 20 inch aluminum intel based late 2007 model. I am getting the error of the blnking folder w/question mark. So I put in the installation cd and booted it while holding c, tried to repair the drive and the drive didn't even show up, next i went into verbose mode and single user mode and saw that there was an error loading the kernel 'mach_kernel' (0x12), after that i tried again to boot installation disk and try to reinstall os while archiving, again the hard drive wasn't even showing up for the destination location to install the OS on. I am almost positive the Hard drive is dead so I called apple to figure out what hard drive i need to purchase to replace it and go figure they said they can't tell me. Can anyone point me in the right direction, and maybe a website i can get it from, i have been searching but i am not positive which one i need. I know i had the hitachi 320 gig hdd previously, i would like to go bigger but i am not picky. ANy help would be GREATLY appreciated!!!!! Thanks