http://en.wikipedia.org/wiki/Dead_pixel

XKCD at it's best...
(see this: http://xkcd.com/395/)
Ouch about the pixel....
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Please exchange this coupon for one (1) free internet.

I've seen dead pixels brought back a bit of gentle massage, even if only temporarily.

Gently rub the screen around the dead pixel with clean fingertip in a circular motion - dont press too hard. Might work, might not. No responsibility taken for further killage of pixels if too heavy-handed.

Good luck.