Monitor Interference

Since I don't have an Apple display, I didn't want to post this there. But I have a bit of a problem running my display at the 75 Hz refresh rate. There's a furnace or something in my building that must sit almost directly under were my desk is. When it turns on, there's a slight flicker in the screen. If I change to 85 Hz, the flicker is gone, but the monitor isn't as sharp (1024x768).
What can I do to remedy this? Obviously the furnace or whatever it is is running at or near the 75 Hz frequency and causing this very slight (but quite annoying) flicker.
EDIT: I should add that the monitor is an old Samsung SyncMaster 753DF (17 " Flat Screen CRT). It's been a good monitor and still has a great picture.
Message was edited by: neonsox

It depends if it's an electrical interference, or magnetic interference.
If it's electrical, I don't know. If it's magnetic, I hear putting some kind of aluminum foil under the monitor (as the furnace is under it), might help. I think it WAS a aluminum foil, it might have been something else though. All I know, is it was something that prevented the magnetic waves from passing through.

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