Firstly do all of the monitors work at the moment have you checked them? Also, I'm not sure how many monitors you are limited to through windows screen resolution changes but that may be an issue as well. With 3 monitors through eyefinity you need a display port as one of your monitors to pull it off.
All monitors are confirmed working, and yes, I have one connected Display Port to DVI adapter, and then to the DVI port into the monitor. I do not want to game, just an extended desktop. Catalyst program recognized all three monitors, but won't allow me to use them.