I had my Steam library installed on an external HD that failed. I was able to re-download everything free of charge but I only did so as I wanted to play each individual title. So, quite a bit of time passed on some of them. I had an issue with LA Noire when I finally reinstalled it. It installed fine, but wouldn't launch. I found some info on a couple forums on things to try but nothing worked. I didn't put much more effort into it, but I felt a functional patch should have been available directly from Steam.