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How do I prevent the screen from going blank?

This is an X power-saving thing.
Firstly, you may need to install xset, a lightweight application that controls some X settings.
apt-get install x11-xserver-utils
Now open up your ~/.xinitrc file (if you don't have one then create it) and enter this:
xset s off         # don't activate screensaver
xset -dpms         # disable DPMS (Energy Star) features.
xset s noblank     # don't blank the video device

exec /etc/alternatives/x-session-manager      # start lxde
This file runs once every time X starts and should solve the problem. I copy and pasted it from my own .xinitrc and can confirm that my screen does not blank.
http://gengwg.blogspot.com/
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