If you focus slightly to the side or above or below your monitor, does the glow seem to change position?
I ask because the human brain tends to remember strong sources of light. For example, if you watch your TV completely in the dark, then turn it off suddenly, you can still see it vaguely. (I first thought this was just the image staying "burned" on the TV, but the luminous phosphorus doesn't maintain an image without an electron flow on it.) The same thing happens with bright lighting sources (especially flourescent lights), and sometimes with digital LED clocks and similar things. Except with the LED clocks, you only need to stare at it for a few moments, and the image gets burned into your eye slightly. I always forget that, and think I'm seeing stuff move in my room... when I move my eyes.
Anyway, experiment with that.
Of course, if the yellowish haze is brighter than the effect you'd get with the above examples, I'll have to tell you that your monitor's haunted, like Flexor said.
Hmm... come to think of it, a green LED would cause a faint yellowish haze on nearby things... like on on my monitor.
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[This message has been edited by DogSRoOL (edited March 07, 2004).]