About two weeks ago, I was browsing in Chrome when the active apps partially froze and the CPU (?) fan turned up to max speed. Shortly thereafter, the entire system froze up. I held down the power button for 8 seconds to force shut it down. The restart was unsuccessful, as the screen would go black shortly after the system (or recovery) partition was selected. So I took it to the GB, the tech told me the partitions got corrupted and the only way to get the rMBP going was to install 10.8 off an external drive. So I did and reinstalled my entire system. Today I headed to BB to get a USB3 external disk to use as TM backup disk. As fate has it, right as I was going to do a full backup, the browser froze, the fan sped up and then the computer locked up. Now I can't even boot into the external recovery disk. Swell, guess I'll be returning this rMBP for a new one.