My best guess is that you have the monitor in a spot near strong EMF or there is a lot of EMF radiation in your new spot.
I have this same exact problem at work. Found out that the cause of this was the subway station that is under my building.
The "solution" to this problem is to get a LCD monitor, although newer monitors seem to be better sheilded to prevent this.
The cheapest thing to try is moving the monitor do a different spot and see if that fixes it, it's possible that the other side of a wall has a microwave or something that is causeing the interference. Either way good luck.
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