GForce4Ti w/ Dual Monitors

in Genius Bar edited January 2014
I (actually my boss) just got a Dual 1.4 GHz with a GForce4Ti and a 23" ACD. He had an old 22" ACD (the original ones with DVI) and figured he could connect both displays. However, with both displays connected, an image only appears on the new one and the mouse (and keyboard) doesn't work. Either display alone works fine. We tried plugging the keyboard/mouse into both displays and into the computer directly. We tried with the USB cable from the 22" plugged in and not plugged in. Any ideas? He has sort of given up for now, but we still have hope of getting it working.
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