In the terminal as normal user..
displays the status of your screensaver, power saver settings etc..
xset s 0 0
this will kill your screensaver until your next reboot
xset dpms 0 0 0
Kills the dpms (power saving) settings, again only for the current session.
Since these manual settings are reset on reboot, you might like to add one or both of the commands to your boot scripts...