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BBC Kicked out of School Over Wi-Fi Scaremongering
h2g2bob writes "Ben Goldacre reports that the BBC Panorama team, while scaremongering over the dangers of Wi-fi, were told to leave the school because even the kids could see it was dumb: 'When the children saw Alasdair's Powerwatch website, and the excellent picture of the insulating mesh beekeeper hat that he sells (£27) to protect your head from excess microwave exposure, they were astonished and outraged. Panorama were calmly expelled from the school.' Should we be pleased that the kids can out-think TV producers?"
A much more noticable effect is the horizontal scan frequency (15.625 KHz for PAL) - this is in the range that younger people can hear, but older people can't (your hearing gets worse as you age - but at different rates for different people).
So as a teeneger / mid-20s, at some point you'll find yourself in the company of other people of the same age where some of you can hear the (annoying) noise, and some can't.
I think a lot of switched mode power supplies also tend to operate in the same frequency at their standard load (their frequency can change depending on how much current is drawn) leading to a similar effect with all sorts of electronics : including perhaps the circuitry for the 30KV(ish) high voltage part of the CRT (which LCDs don't require)
From your description of the noise as a "whine", it seems more likely to be one of these two effects rather than the 50Hz or 60Hz vertical scan frequency (which most people would describe as a low "buzzing" sound rather than a "whining sound")