OK to set up an external monitor with everything on?

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If I plug in my Dell monitor to my laptop via a DVI cable without powering down either, everything works great. The monitor is instantly recognized and there are no problems. Or is there? Could I be doing some harm by making the connection while live?
 
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If I plug in my Dell monitor to my laptop via a DVI cable without powering down either, everything works great. The monitor is instantly recognized and there are no problems. Or is there? Could I be doing some harm by making the connection while live?

I have never known this cause any problems.
 

chscag

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If I plug in my Dell monitor to my laptop via a DVI cable without powering down either, everything works great. The monitor is instantly recognized and there are no problems. Or is there? Could I be doing some harm by making the connection while live?

Probably not, but why take the chance? How much trouble is it to connect the DVI cable first and then turn the monitor on? Better to be safe. :D
 

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