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Originally Posted by patrickp
Different people see flicker at differing refresh rates: some people where I work have refresh rates of 60Hz set: they don't see any flicker. I see serious flickering and can't look at their displays for any length of time without getting a headache. One person is using a refresh rate of 60Hz deliberately in getting a higher resolution and is quite happy with it.
Yes; I'd really consider 75Hz a working minimum. But it varies from monitor to monitor - how come you (or most people) can look at a TV refreshing at 25Hz and not see flicker - or a light bulb (well not directly) at 50Hz? Because each refresh takes longer to fade, so it blends into the next iteration and you don't see flicker. Each monitor refresh fades a lot faster (it's meant to) so you'll still notice flicker at higher refresh rates.
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I considder 85hz the minimum I would use on any of my machines, though 75hz is also acceptable.
As for the OP's orriginal problem, have you got desktop speakers? place them too near to the monitor (the rear especially) and you will cause a flicker like that.
have you left any magenetic screwdrivers ontop of the monitor?
Is there any form of radio broadcasting equipment nearby? (Im talking more along the lines of a local radio station rather than digi-senders etc).