My computer is programed to go into hibernation if it’s not being used for more than 30 minutes. It did so while I was busy doing something else, but when I returned all I could get was a black screen. I turned off the computer, then turned it back on. I got a restart error message. I tried to continue with the restart only to have the computer perform a memory dump. After the third attempt I let it dump the information it had saved as it went into hibernation. This time it ran a checkdisk. What does it mean when it says a volume is dirty?

It seems to have rebooted okay. I’m currently running an anti-virus scan, just in case there was anything it missed anything, but I’m terrified to turn it off for the night.