score:4

Accepted answer

This is untested as jsFiddle isn't responding for me right now, but I would take a look at

http://www.highcharts.com/ref/#plotOptions-series-states-hover-marker--fillColor

This seems to be the options for markers on hover.

Edit based on janb's comment:

 {
    y: 5, 
    marker: { 
        fillColor: '#222', 
        states: { 
            hover: { 
                fillColor: '#222' 
            }
         }
    }
}

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