HOWever, I need a screensaver. FRom reading previous threads, there appears to be a screensaver that is a blank screen which I would very much like to have.
WHere can I enable this screensaver as I have waited for minutes and the screensaver does not appear?
Have you seen this thread? I've converted the XScreenSaver packages from Debian and they which give you a screensaver daemon and a configuration GUI to set the timeout.
You could try googling for "xorg blanking" to set up a timeout for when your monitor goes to powersaving mode, in /etc/X11/xorg.conf.