I am trying to set up 3 monitors with the Radeon HD 5770 I recieved a few days ago. I have read that I can use 2 DVI ports and an active DisplayPort adapter for a third DVI monitor. I have purchased this adapter: http://www.accellcables.com/products/DisplayPort/DP/dp_dvid.htm

I have the two normal DVI monitors working, but when I try to extend the display to the third, I get a message saying the system has detected a problem with the connection through the display port which may limit resolution/refresh rate. I know that all the cables are fine, I have replaced the adapter, the monitors all work, I have tried different monitors through the adapter, and even nothing but the adapter, but I cannot get any monitor to work using it. I am trying to use 2 Dell monitors and an Acer. Have I overlooked something? Is there a compatibiliy issue I missed? Any suggestions as to what I could try? Thanks in advance.