My 2010 MacBook Pro 2.4ghz 13" doesn't recognize any hard disk . All of a sudden, everything began to crash (mac froze, didn't respond).. when I tried to reboot it didn't recognize my hard drive. I've already tried resetting PRAM and all the other things you can reset. I thought maybe my hard disk died, so I replaced it for test purposes with 3 (yes, three!) other hard disks, none of them worked out . Now I've installed OS X on a 16GB USB stick, and I'm able to boot from it and browse the web but it's very slow. What can I do ? Is is just the hard disk connector that needs to be replaced or did the motherboard die (don't think so, since booting from USB works good)?