Yesterday I was trying to connect a Viewsonic Projector to my Samsung RC420 laptop… I followed this steps:
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I Plugged the Projector to a power source, in parallel I did the same thing with the laptop. Then I turned on the laptop, but not the Projector (this one turns a bright light when is connected to a power source).
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I put the VGA Cable to the Projector (this one being still turned down) and then when I was getting close to the VGA port of the Laptop… BAM! A big spark appear between the port and the cable! Immediately the whole electricity of my floor went off.
A part of the port in my laptop kind of… melted down. It seems to be where the spark started. The same thing happened to the part of the cable involved.
Now I'm using the laptop, and it seems that there is no problem in it, I haven't connect anything to the VGA port yet. And the projector is still working to, well… it turns on, and I haven't connect anything yet too.
The projector was connected to the power source by a homemade electric extension.
Best Answer
And, Thats why.
The outer casing of a VGA port should be a ground. It was probably at high potential. The other end was at ground potential. Apparently that caused a bolt of electricity to jump across and zap your laptop since electricity goes from low potential to high potential
And, thats probably the fuse or ELCB preventing anything bad from happening.This means there's a short circuit somewhere.
As for the laptop still working, well, you got lucky, and the electricity probably got conducted to ground. It might have fried something but we can't tell without you testing it.