I have been having this problem for a few months now. I put my PC on sleep quite often, but unfortunately when I wake my PC, I often get a black screen. So I have to restart my computer from the power button. When I start it up again, it shows me a Windows message that is all broken up and I can just make out that it says something like 'something went wrong' and it counts to 100% and restarts itself. After the restart it's fine but this is becoming very annoying. I have an GTX 660 2GB SC running Windows 8 64bit. Sorry for such a long message, if you are still here then any help is greatly appreciated. Thanks in advance!