Green hue to black images ?

My eMac (1.25 GHz,USB 2.0 model) looks fine when I look at any kind of photo or graphic on the screen. Unless it is a graphic that is mostly black. Like the iPhone page now on the Apple home page.
When a black image is covering most of the screen the menu bar and other exposed areas have green hue to them. Even the non-image area of the CRT turns green.
Have any other graphic on the screen and it looks crystal clear and sharp, most importantly the correct color. The non-image area of the CRT is black.
I have tried calibration, better, but not resolved.
This is not a slight hue difference, but a large on.
If the guns were damaged I would expect this hue all the time, but I can not understand why it comes and goes. Luckily it is not present more than it is.
Any ideas what is wrong ?
And how to resolve it ?
I just reinstalled 10.4 and applied all updates.
Thanks,
Mike

Hi Michael
Some thoughts:
1. Have you done any simple tests to exlude optical illusion, by holding up a black sheet of paper and trying to reproduce the effect.
2. Degaussing the monitor is simply done by leaving it switched off and physically unplugged, and disconnected for three or four hours. Also consider if it is receiving interference from other strong electromagnetism, say on the other side of the wall.
3. I am wondering if your eMac was one of those affected by the 'bad capacitor' problem. Though, to be fair, your symptoms don't exactly match the condition of those afflicted models.
you can check whether your model is affected here:
http://www.apple.com/ca/support/emac/repairextensionprogram/
Good luck in solving your mystery.
regards roam

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