The only thing I can think of is a power polarity issue. But that would have required both systems plugged in either to a charger or other AC powered device like a printer or external HD which is directly powered.
Basically, one of the MacBook Pro’s cases is tied to the White (Neutral) side of the outlet and the others case is tied to the Black (Hot) so it fried things!
This can happen when you are plugging two chargers into the same outlet if the charger is not properly designed (knock off charger)
[image|2131100]
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Make sure the chargers are all lined up in the same direction to be safe.
The only thing I can think of is a power polarity issue. But that would have required both systems plugged in either to a charger or other AC powered device like a printer or external HD which is directly powered.
Basically, one of the MacBook Pro’s cases is tied to the White (Neutral) side of the outlet and the others case is tied to the Black (Hot) so it fried things!
This can happen when you are plugging two chargers into the same outlet if the charger is not properly designed (knock off charger)
[image|2131100]