I've been in the habit of leaving my computer on all day, typically running a time-consuming task like a torrent download.  I turn my monitor off because the LCD gets pretty warm, and when I'd get home from work I'd turn the monitor on to see the screensaver running, then I'd move the mouse and have to log in.

Recently I noticed that I didn't have to log in anymore when I turned the monitor on, but it took me a few days to realize that was because my screensaver wasn't coming on at all.  I've played around with the settings in the Display Properties, but nothing makes any difference.  I've tried every possible screensaver, disabled the displaying of the Welcome screen, changed the amount of time before it activates, and messed around with the power saving settings.

I can't think of what would have caused this to break, as I don't believe that I installed anything significant recently nor have I had any significant crashes.

 

I did install and later uninstall WindowBlinds, but I'm fairly certain that I had a working screensaver after the uninstall.  Could that have anything to do with this?

 

Please help.  Google isn't telling me anything.