Ok, so in 2012 I bought MBP for my wife. It's a early 2011 13-inch model, with 2.7 dual-core i7, 8GB RAM and 500GB HDD. First the computer felt super-fast. If functioned perfectly in Photoshop and data processing tasks (my wife's work), and was working great with external 23'' Dell monitor too. So my wife was able to do design work in photoshop, with Illustrator opened at the same time, switching to Chrome for image references (usually 5+ tabs) and watching streaming HD movie in Safari on external monitor. And then something went wrong. We went on a trip and took the laptop with us, and installed Mavericks 2 days before that. When we came back and started using the laptop in normal mode we've noticed that it became significantly slower. First the videos played on external monitor became laggy, and then impossible to watch during working in Photoshop. Then they became impossible to watch with NO programs running in the background. So I thought it was a software thing. Reinstalled Mavericks with data restore. Didn't help. Installed mavericks on "clean" formatted machine and didn't restore. Didn't help. Then I decided to downgrade back to ML, did a clean install, didn't help. I understood that the problem is probably hardware. I thought that maybe the HDD was damaged during the trip (like shock damage from bus vibrations or something). I did all the possible Disk Utility verifications and repairs, it also didn't help. Then I downloaded Apple Service Diagnostics files and ran them. Computer passed all of them except the last one verifying SMART status it was failed. So I thought it's something with the hard drive. Downloaded a SMART utility and it gave a following results (see screenshots). Not sure what to do with that info now. We really don't want to sell this laptop to someone as it is obviously faulty now, but we don't know how to fix it. Another thing is that with a clean install of ML when I open a activity monitor I see that 4.5 gigs of ram out of 8 are used all the time. Not sure with what too. We live in Ukraine, there are no Apple service stores here. There's also no apple care applies to this machine, so this forums are my last hope to figure out what the thing is. Thanks, Max.