EMac screen going brown

Hi there.
I have searched this forum trying to find the right answer, but I'm not a hardware guru so I can't really identify my problem. I hope you can help or point me to some relevant posts.
To summarise, over the past few months I have noticed faint brown patches appearing. One of them covers the bottom left handside of the screen and is about 1/3 of the screen size. The other is smaller in the top right handside with an even smaller patch just below the eMac logo at the top. The two largest patches are diagonal and extend to the screen edges. They are present all the time at both start-up and after several hours of the machine running.
As I said, they are very faint, but if I use a blank Keynote presentation or Safari loads a page with a lot of white background, the patches become much more distinct. In general the screen just doesn't seem as crisp as I remember when the eMac was first bought.
The eMac has been used extensively, but not to the point where it is left on 24/7. It has no external speakers and the nearest radio is some distance away in another room.
I have read on here about some eMac's being recalled for display issues but can't find any official notice of this. Mine is a 1Ghz model purchased in 2003. I have also seen in a local computer shop cleaning kits for the internals of CRT monitors. Could the problem be caused by dust and if so how is the best method to remove dust without zapping oneself with a million volts?!
Any help or links would be much appreciated
Regards
Will.

The eMac used to be kept in a conservatory (garden room) which was always relatively cold but until 12 months ago it has been moved into a proper 'indoor' room.
The eMac hasn't had anything new added to it except extra RAM which was added at the start of the year before I was aware of any display problems. The only display related software I have is Teleport but I shouldn't think this would cause screen problems?
The screen hasn't been cleaned with any nasty cleaning agents. If finger prints appear, I use a damp cloth.
Being an environmental guru I do have many energy saving light bulbs, but even as I sit here in the darkness, I can see brown patches.
As far as I'm aware electricity doesn't come into this side of the building, though the eMac sits on the desk directly above the wall socket it plugs into so I might try plugging it in on the other side of the room.
That certainly doesn't sound promising what you quote at the start of your post Mike, but I will look up what nvram means and have a go at resetting it after a thorough backup.
Thanks for your tips.
Will.

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tb8,
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