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usually the headphone jack is for audio CDs
either find the 'degauss' option if the monitor has an OSD or a button to degauss, otherwise its automatic and a function of temperature, that is when the monitor has been off for a while, it should automagically degauss itself when you switch it on, it has to be off long enough for the sensor to cool down.
Failing that take it to a TV store and they'll use a special ring magnet that will degauss it for you.
you coiuld also try turning the monitor around, the earths magnetic core does affect the monitor sometimes, especially if its been in one position long enough, this is not likely for your situation, but it can help.
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