Thanks for the reply poweredbydodge!
Unfortunately the latest set of drivers no longer seem to support my outdated Geforce 4 MX440..
But I found a solution on the Nvidia forums..
Basically I just had to:
Boot the kernel with agp=off
and edit /etc/pm/functions-nvidia, just commenting out "/usr/sbin/vbetool post" in resume_video() like:
### /usr/sbin/vbetool post
/usr/sbin/vbetool dpms on
/usr/sbin/vbetool vbestate restore < /var/run/vbestate
) >/dev/null 2>&1
It's working now!