au quantreau
if the monitor is displaying a message - it's displaying - so it's not broken
resolution tends to just distort and there isn't a frequency setting in the monitor's menu
sounds to me that the refresh rate was wrong ....
do as chuck says and boot into safe mode
control panel | display settings | monitor
http://i33.tinypic.com/4iblh1.gif
there should be a tickbox hide modes this monitor can't display (top monitor settings -only 60Hz displays)
with the tick - or if the wrong monitor properties are selected - you can get at frequencies that your minitor can't cope with (bottom half)
go for 60 as a default.