Hello,
I recently moved and when I set my computer up again i cannot get my fourth display (a tv) to work along with my three acer monitors.
I have the newest drivers directly from nvidia and when i open the NVIDIA control panel and click the checkbox to enable the fourth monitor (on the 9400gt) it pops up a bubble that says "This GPU supports a single display". At the same time the 8800GTS is running two displays just fine.