Dual display causes green screen and freezes

[henryma]

My computer broke down a week ago and I decided to take out working parts and put them in an older computer. My Sapphire HD4850 is a few years old now (I bought it not too long after it came out) and when only using one monitor the system runs perfectly fine and I can change resolution and everything.
When I plug in my Viewsonic VA1912wb alongside my Dell S2209W and attempt to change the resolutions(both of them work fine when not on dual display) the screens will turn green for a bit then return and freeze up.
I am running an AMD Athlon II X2 240
Gigabyte GA-MA785GM-US2H
G.Skill 2GB of unganged DDR2 Ram
Nothing is OC'd

I've updated my CCC and tried alternating the ports/cables of the monitors to my graphics card.

Again, everything works fine until I try to change the resolution of either monitors.

 

[cusideabelincoln]

You could try using SurroundView. Enable the onboard VGA and plug one of the monitors to the onboard.

Otherwise, you might have to do a clean driver sweep or force clockspeeds on your card.

 

[henryma]

Thanks for the advice, I downloaded Rivatuner and forced the clockspeed lower and now it's working fine.