Hi all, I have a situation involving my editing software and needing to upgrade my OS. I'm running Lion on my Mac Pro early 2008, and using FCP 7. My question has to do with an older drive that I have installed in my tower. I took the original hard drive out of an older Mac Pro running Snow Leopard that had a kernel panic. So far that drive has worked as another drive on my computer (I installed it internally), but I've never tried to boot the computer from this drive. So, now I want to update Lion to at least Mountain Lion or El Capitan, but I'm worried that this might cause problems with FCP 7. I've been wondering what to do, and thought that maybe I could try booting the old Snow Leopard drive, and updating that, since FCP won't be affected. My question: 1. Is there a risk to booting from a drive that came from a computer that suffered a kernel panic? And this wasn't just one kernel panic- it was not fixed and never went away, so I retired the computer and bought another (used) mac pro. Could this somehow infect the other drive (my main drive) that is now running Lion? Ideally it would be nice to have a newer OS on one drive and keep Lion as is, since FCP is working fine on it, and I'm in the middle of a project and I don't want it to get compromised. But I'm a bit worried that something could happen to the computer if I boot from the old drive. Any thoughts? Thanks!