Upon investigating, I made sure the computer went into standby and resumed from the start menu just fine. I then noticed that Avast was set to generate a VRDB (virus recovery database) when the screensaver was active so I turned that off with no luck. I tried turning off the screensaver totally and having the screen go into standby, and that works fine,but the computer still won't go into standby after the specified time.
Then I set the computer to standby after 5 minutes of inactivity and it did so and stayed that way just fine. Tried again with 45 minutes and it was no go. Any ideas?