Why do some games disable 2nd monitor?

clutchc

Titan
Ambassador
I have a 2nd monitor that I like to keep open for obvious reasons when gaming. But some games cause the 2nd display to blank when they run. Any way around that?

Both are connected DVI.
 
Solution
I use sli - works fine - I have 2 24" monitors and 1 30" I use 2 24s for gaming - one for game in windows mode and the other for TS & afterburner.
-Bruce