Hey all, Just the other day while browsing around with my Macbook Pro, the macbook decided to freeze up. When I had restarted the Macbook would only boot the the prohibitory sign. Oh okay, I had thought, the Hard drive was dying. Logical step since the day before a couple of the applications were crashing randomly and I felt like a lot of I/O errors have occurred. The HD I had installed was a OCZ Vertex 3, and them failing wasn't too rare of a thing I had read. Now, here's the fun part. Since Boxing day came up I had a chance to buy a sparkling new Samsung 840 Pro. Did so, cloned my old HD into my new one, popped it into the macbook... and nothing. I held down option to try to get into somewhere during boot,but the mac only provides me with an internet recovery option. Not sure what to do at this point, the Mac COULDN'T see the vertex when it was in Internet recovery in the disk utility tool. But it can see the 840 Pro. Also a funny thing, when trying to fresh install onto the 840 Pro, the actual Macbook tells me that "Cannot be installed onto this disk". Also at Disk utility, when I try to fresh partition it, it tells me the disk can't be unmounted. Trying to pick a couple of brains here, the best I can come up with is that the SATA connector is dying/messing up. Agree/Disagree? I apologize for the fact Im all over the place, It's been a rough couple of hours. Ask questions and I'll run tests/tell you results. Thanks you all!