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Do you have onboard video? If so, remove your GeForce card and plug the monitor into the connector on the motherboard. If the monitor is fine, it's the card. Otherwise, probably the monitor. I've lost two monitors due to heat in the summer in the past few years, and both times, brightness was affected, and the screen would sometimes shake.
I did have a Sony Trinitron 17" monitor at one point that I got used from a yard sale.. Used for good reason. The screen would turn blue every few minutes, and sometimes, the text would trail a bit. I'd be willing to bet the problem is your monitor, but if you have onboard video, test that first.
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