Hey everyone, My late 2011 15" MacBook Pro (i7 2nd Gen, 4 GB, 750 GB, HD6770) started crashing last Friday. I have upgraded the RAM to 8 GB, removed the internal optical drive, replaced the 750 GB hard drive with a 120 GB OCZ Vertex 3 SSD, and moved the 750 GB hard drive to the optical drive bay. I had OSX installed on the Vertex 3, a ~200 GB Bootcamp Windows 7 partition on the 750 GB drive, and the remaining space on the 750 GB was given over to the original factory Mac partition which I kept for data storage (it still had OSX installed on it, but I never actually used the partition as a boot drive, my SSD OSX installation was my main one). Last Friday morning, while I was in class, my MacBook suddenly did something I'd never seen before. While I was browsing the internet in Chrome, a message came up saying that the MacBook must shut down immediately. The background behind the message was darkened and the system was totally unresponsive until it eventually restarted. A bit of searching online revealed this issue to be something called a "kernel panic". It always happens within a few minutes of booting back up into the Vertex 3 installation of OSX, but the timing is different every time; sometimes I don't have time to even open an app up after booting up, but other times it lasts up to five minutes before crashing. Since this issue started happening, my Windows partition (on the 750 GB hard drive) will not boot either: it says that it needs to perform startup repair. If I perform the startup repair, it will give me a blue screen of death shortly after the loading screen for repair appears. If I do not perform the startup repair, the system will simply crash and restart. In addition, the original factory installation of OSX on the 750 GB hard drive (which I normally do not use) will not boot at all, and gives me a sort of "black screen of death" with error text when I attempt to boot from it. Prior to the kernel panic issue appearing, this OSX installation was bootable, and I had booted into it by accident about a week beforehand. So now neither OS installed on the 750 GB drive will boot, but the OS on the SSD will, however it crashes soon after. I hypothesized therefore that the 750 GB drive had failed or was corrupt since there are quite a few apps (several dozen GB at least) that are stored on the 750 GB drive but installed under the SSD OS, so I thought perhaps it is these apps starting up after the OS boots from the SSD that were causing the kernel panic, and a bad drive would explain why neither OS on the drive boots properly. However, upon plugging the 750 GB drive into a spare SATA port on my desktop, all partitions appear and are reported as "Healthy" under Disk Management in Windows 7, and the files on the Bootcamp partition are visible and seem intact and functional from my preliminary testing. I am currently in the process of scanning the disk for errors with HD Tune Pro 5.00, but it appears to be totally fine according to that scan so far, so I'm not sure it's the hard drive any more. I was able to recover two of the kernel panic reports upon rebooting the system after the crash, but the system crashed too quickly in most cases to have a chance to save the other reports. I have attached these reports to this thread. I was unable to recover dump files from the Windows 7 BSODs because they occured during the attempt to load startup repair, and the OS was not properly loaded so it appears that the dump files were not saved properly because they did not appear in the specified folder that they should have gone to. I had originally thought the hard drive was the problem and I purchased a 750 GB Scorpio Black to replace it, but I'm not so sure now. Could the RAM or something else possibly be causing this type of issue? I'm really stumped here guys, any help of comments would be beautiful, thanks in advance. Very long post, I know, so heres the TL;DR: MacBook Pro with SSD + 750 GB drives started kernel panicking 0-5min after boot into OSX on the SSD, OSX and Win 7 on the 750 GB both no longer boot. I thought the 750 had failed, but connecting to another PC showed all partitions as healthy and disk scan is showing no errors so far. What could it be?