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hi
Could be that your Monitor is aging , or else it could be a false contact .
False contact has to be look upon the circuit borads . An inspection of the borad might reveal that a componet is loose needing resoldering . Other , could be a failing component on the vertical u horizontal circuit . Care should be taken when handling the monitor since some parts can hold up to 25 Kv depending onthe size of the picture tube .
Else it could be that you have not chosen the proper monitor in your linux setup and have the wrong drivers for the video card for that arrangement .
Good luck
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