I get black screen randomly on boot with my 470's since I got them, i just turn my monitor off then back on. I am not sure if that would fix it for you. For me it seems like it loses the signal somehow after driver swap. I turn monitor off and then on and it fixes it.

These drivers are UNREAL on bc2 for me, great IQ no fps loss from any of the past drivers and I have tried them all. Also my gpu usage is as close to 100% constant in game as I have ever seen it I think.