Green-ey/White-y blotches around perimeter of screen when displaying black

Just re-hooked up my imac g5 which i sold to my dad 9months ago - in that time he hasnt used it! i know kinda what was the point in buying it! so rather than leaving it to rot in a corner, ive set it up so that i can watch the off dvd etc... (i now use a 17' powerbook for all my work)
i put on 24 and immedietly notice subtle light blotches around the perimeter of the screen when in black. Almost light green/white colour.
i dont remember noticing this before... perhaps the screen is on its way out? i still have 2 months left of the apple care so at least i can get it repaired if a major problem.

anyone got any ideas?
to narrow it down a bit, i think its the light emission that is causing it around the perimeter of the screen.

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