I have an iMac 20" 1GB ram 250GB HDD. Recently taking extremely long to load and shutdown & sometimes it just gets stuck on the grey apple loading screen w/spinning wheel on startup. I've tried rebooting into safe boot and single user. works temporarily when safe booted. reset permissions in single user mode and still have the same problems. For some reason it will not let me boot into verbose only get blinking folder w/? on it which happens sometimes when i attempt the aht. I didnt have many important files so i attempted wiping hdd clean and reinstalling os. But it still does the same thing. I finally ran the aht and got error code 4HDD/11/40000000:SATA(0,0). What does this mean? is my hdd or hdd cable shot?