X to not blank screen or switch off monitor

[Brent Clark]

Hiya

I got a very minimalistic installation of FreeBSD, so much so that I 
login on console and just run startx and im presented with twm.

The problem I seem to face is that I cant get X and / or freebsd to not 
blank the screen and / or switch off the monitor.

Ive run

xset s noblank && vbetool dpms on

I even set blanktime="NO" in /etc/rc.conf.

And yet after a period in time of idleness my monitor goes off.

If anyone can help me understand or achieve my objective, i would be 
most grateful.

Kind Regards
Brent Clark