My external monitor worked with my MacBook Pro before I took it on a little trip, now it won't work.  Any suggestions?

My external monitor worked with my MacBook Pro before I took it on a little trip, now it won't work.  Any suggestions?

Never mind.  Sorry.  It fixed itself.

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    Never mind.  Sorry.  It fixed itself.

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    Thanks for the useful feedback, Knucklesmac. I agree. I must have blown something on the logic board -- because I had a faulty old KVM switch that would not switch between computers without some nasty hot-plugging/unplugging the VGA video cables. (wince!). It's like when Dizzy Dean ruined his arm because a line drive hit him in the foot and he readjusted his mechanics around the injury. I take the blame because this has been a great computer, and does not deserve any blame.
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    Can you start Firefox in [[Safe mode]] ?
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