My PC boots up normally, but in less than a minute the screen goes dark and then reverts to 8 bit color and 600x800 resolution. I go into control panel and reset it. This happens again. I reset again and then it works normally for hours. I bought a new graphics card but got the same problem. But now, for no apparent reason, there is a new twist. Instead of clicking okay and the correct settings going into effect, it says I have to reboot my system for the new settings to take effect. This starts the whole process all over with the reverting to 8 bit color. At this 600x800 resolution, the window is too large for the screen preventing me from getting to the bottom of the window to click "Okay" to allow the changes to take effect automatically instead of with reboot. Any help would be greatly appreciated.