I have a dual boot with Mint Linux and Windows 7 (both 64 bit). I was on Linux and tried shuting down but it didn't work properly. I held down the power button. Windows was working fine. Next time I tried logging into Linux it kept saying "could not authenticate" and wouldn't let me type a password. I restarted the computer and the graphics are all messed up (even before the boot manager loaded). I logged into Windows but the graphics look 16 bit or something. Also I think some settings are messed because I got an error about how hibernation is disabled. In device manager the video card has been stopped with Code 43. Edit: thank goodness restarting the machien fixed it. I don't know if it's safe to boot into Linux.