I have an early-2011 13" MBP. I had a RAM replacement done by Apple in February (I was in NYC at the time and my warranty was valid up to 2 more weeks, so it's was easier). Recently, I noticed my MBP was getting really slow. I installed Mountain Lion and it got worse. Today, it just stopped responding and when I tried to reboot it, it got stuck on the Apple logo. I tried everything I could find online (safe boot, NVRAM/PRAM reset, fsck -fy) and nothing worked. I don't even remember everything, but I got errors like "disk0s2 media is not present" and "drive phy pm failed". When I run DiskUtility, "320 GB ST..... Media" is highlighted in red and it says "This drive has a hardware problem that can't be repaired" and SMART status is failing. But when I ask to verify the Macintosh HD volume, it says everything is okay. I'm no expert, but that means my hard drive is pretty much gone, right? I don't have a backup (I know I should...), but I'm not really worried about my data. The only thing I haven't tried is reinstalling Mountain Lion, is it even worth trying it? I'll take it to an authorized service provider (I live in Brazil, it's not like I can find an Apple Store on every corner), but I just wanted to know everything I could before, so it's a little harder to be fooled. Also, as I'm pretty sure they will charge me twice as much as just half the storage capacity as if I bought a hard drive upgrade kit from ifixit, I was thinking about replacing it myself. Again, I'm no expert, could I do it with the ifixit guide or even the Apple one? And most importantly, can I be sure it's the hard drive? Or can it be just the hard drive cable or something else entirely? And if it is the hard drive, could I have done anything to prevent it, or these things just happen? Because I bought my MBP not even 18 months ago, it never fell and I never spilled anything on it.. Anyway, thanks for the help!