I have set the monitor and CPU to "never" sleep, but after a period of time the monitor appears to go to sleep and when I try to wake it the screen comes on for two-three seconds and then goes back to black. I have to use the power button to get it back on for a few seconds and if I do this a dozen of so times and click an application each time it will finally stay on. I swapped monitors and the new one does the same thing. All drivers and updates are current. Do I assume it is the video card? System is Win 7.