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its probably either a grounding problem, bad video card, bad cable or bad monitor. Hard to tell remotely.
check everything is earthed properly if you have a multimeter you can check the earth, a lot of fancier extension coords have earth checks built in, but they are just good for is it earthed or not, not if its not earthed well.
share the same ground for compuer and monitor, try rerouting cables, don't cross power cables with video cables, don't wrap cables into bunches, make sure its screwed in tight, if the video cable came with the monitor its should be fine, however if it didn't it might not be spec'd for that refresh rate.
video card is firmly in place, also screwed in, sometimes moving other cards around or cables in your system can help.
all of the above is if its intereference, if its something else like the video card not being able to hande it , it won't do anything.
60 or 50 hz shimmering is usually the sign of bad earthing.
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