I have Windows 7 Pro 64. I bought and installed the NVidia Geforce GTX 460 video board about 3 months ago. I have 8 G memory and still have about 275G on the HD. I can be doing minimal things on the computer when the screen will black out. The monitor will tell me I am not getting a signal. Then after 2-4 seconds the monitor will come alive. I will get an error message on the right hand bottom of the screen telling me there is a problem with the video driver. I have upgraded the driver each time one comes out. I even went back to the driver that was first installed, but regardless, it still happens. I opened up the case and made sure everything was plugged in and the board was well seated. I have cleaned it out although the dust build up was minimal. My power supply is 700 W. So, I'm not sure why this keeps happening. Any suggestions? Thankfully I don't loose any data during these blackouts.