So I have two Radeon HD 4650 cards set up in Crossfire and I have two monitors running right now (both with DVI Cables from one card)...I plugged in a 3rd 1650x1080 monitor into my other card and...nothing. I get no signal. When I switch my other two monitor's DVI cables into the other graphics card...no signal as well. Help!
As far as I know Crossfire doesn't support three monitors in Crossfire mode, you'd have to disable crossfire to drive more monitors then one of your cards have.