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Everytime i use the computer about 15 minutes into use the monitor will start flashing on and off but the actual power doesnt cycle just the image. Also if that doesnt happen the mouse will freeze. Restarting doesnt fix it its only when I unplug the computer from the outlet does it work again.
Also, since of course the video card drives the monitor, and usually the mouse cursor is also provided as a hardware cursor by the video card, check if the video has a cooling fan, maybe it has seized, or the cooler fins could be clogged with fluff & dust.