Stand By Not Functioning Anymore?

I just installed nVIDIA,s Ge Force MX200 Graphics Card. I finally have it working properly. But, now when I put my system on stand by, as I always do,(it saves time booting) When I slide the mouse, or hit the space bar nothing happens. So I push thepower button, and it comes to life. Go figure. What could the download of the drivers have done,
(if anything)? My power scheme is set to “always on”. Sleep buttons’ set to “stand by” and the Power button is set to “turn off”…..
Any Ideas?