I have a 20" iMac, about a year and a half old. Today, it simply froze so i restarted. Then it would not load OS X. I tried resetting pram and then tried to run disk utility from my install cd. the options to repair or verify were both greyed out. i then tried using target disk mode through my mbp to repair. it kept hanging. soo then i tried diskwarrior. hung also. as a next option i tried an archive and install, but now it has been hung on about 5% of disc 2 for an hour or so. I am unsure if i should power off the system or what, and i dont know my next step. this computer doesnt have applecare so thats a no go.