Assuming you tried what I said and it goes away when you unplug the pump...
Try these simple things first. Move it a little farther away from your monitor if possible, to see if its a proximity issue. Could be its still not far enough away.
Try orienting the pump at a different angle. Rotate the pump 90 degrees within the case, or rotate the whole case.
Try powering the pump from a different source than the PC or monitor.
Post back what you found!
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