Screensaver disabled, screen still blanks

[Eric]

I have the screensaver disabled (using Configure Desktop->Screen Saver and 
unchecking "Start automatically"), and behold, the screen saver no longer 
comes up after the 5 minutes that was previously selected.

However, the screen still goes blank after about 10 minutes or so.

How do I go about disabling that?

This happens with both FC5 and F7 (only ones I have available right now).