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<blockquote data-quote="chscag" data-source="post: 686759" data-attributes="member: 46727">It's possible something could be wrong with the grounding in your MBP, but it could also be your AC mains that you were using it from.&nbsp; An improperly grounded AC main outlet circuit could cause the hot side of the AC line to travel on the metal case of your MBP.&nbsp; That's why we use polarized plugs and grounded AC outlets in the US and Canada.Before you take it into Apple why don't you do some more testing - cautiously:&nbsp; See if you can get hold of an outlet tester.&nbsp; The kind that plugs into your outlet and has three led lights which display the status of the AC outlet and the circuit it's in.&nbsp; (Red, Yellow, Green LEDs)&nbsp; That will tell you if the AC outlet or the circuit it's on is properly grounded.Note:&nbsp; Since your MBP does not use a power transformer, the incoming AC circuitry has to be properly grounded to the AC common to avoid shocking you!&nbsp;&nbsp; BTW, why didn't you just pull the AC plug from the wall socket to remove power from your MBP?&nbsp; Didn't think of that?&nbsp; Happens to the best of us.&nbsp; ;D Regards.</blockquote>

[QUOTE="chscag, post: 686759, member: 46727"] It's possible something could be wrong with the grounding in your MBP, but it could also be your AC mains that you were using it from. An improperly grounded AC main outlet circuit could cause the hot side of the AC line to travel on the metal case of your MBP. That's why we use polarized plugs and grounded AC outlets in the US and Canada. Before you take it into Apple why don't you do some more testing - cautiously: See if you can get hold of an outlet tester. The kind that plugs into your outlet and has three led lights which display the status of the AC outlet and the circuit it's in. (Red, Yellow, Green LEDs) That will tell you if the AC outlet or the circuit it's on is properly grounded. Note: Since your MBP does not use a power transformer, the incoming AC circuitry has to be properly grounded to the AC common to avoid shocking you! BTW, why didn't you just pull the AC plug from the wall socket to remove power from your MBP? Didn't think of that? Happens to the best of us. ;D Regards. [/QUOTE]

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