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Blimey, they say trouble comes in 3's but you seem to have a 4th...!
Never have I seen a white line moving across my screen, only when I played Pong as a youngster on my old Atari.
I have spoken to one of our tech guys here in the office and he basically said he thinks the monitor is "knackered" and it is possibly the firmware that has given up and that is something that can't be replaced.
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