Sounds like one of a number of possible issues:
> video card on its way out
> video card not seated properly
> heat issue
> insufficient power from the power supply or other power connector
> incorrect or outdated drivers, or possible a driver conflict
> OS, virus, or other software conflict/issue
> corrupted game file
> problem w/ your monitor/refresh rate/screen resolution
We will need specific system specs including the make and modem of the video card, CPU speed, ram, hard drive, etc...
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