Laptop "power" or because the home outlet is not grounded

Winter is the door handle to open the door "power" that, when shaking hands with people being "power" to ...... For these situations , I believe you are not familiar with. However, when Testers buy a new laptop on the touch screen lights up red , it was a bit hard to understand .
Recently, people run into this and so Mr. bothering . Repeatedly felt " was electric" when Mr. and son at home to buy a new laptop demo . Mr. Su was suspected computer quality problems, but after replacing the new machine , the situation is still not improved.
What are the causes of notebook " leakage " ? How strong currents which shares will not be dangerous ? These issues , like the enigmatic , troubled Su .
Laptop " leakage " red pencil
March 4 , Mr. Cadence in Licheng District, the city bought a full metal jacket brand laptop. Unexpectedly, when the family was pleased to try out the new computer , and his son got the feeling he was "electric " was. " Hand in contact with the touch screen and the next area will feel tingling ." At first he thought it was an illusion , but to take a test electric pen , turned bright red !
Su believes that the laptop " leakage " , certainly there are quality problems , so they have to call the hotline through the sea and Quanzhou 968111 Industrial and Commercial 12,315 complaints .
"Definitely there is no quality problems , the store does not exist in this case to other computers ." Sales staff said that Su should be measured electrical induction , is a normal phenomenon , probably related with the electrical environment . The brand computer service point staff also held the same view. After Licheng District Trade and Industry Bureau of Industry and Commerce mediation, business as Su for the one with the all-new laptop.
The thought things over. Home after a power plug , Mr. Su has been "power" to it. " There will be plugged in to the feeling of power , light battery will not ." Su believes that in case a computer design problem , no matter how many change can not solve .
Reporters search found that there are many users on the network posted seek " notebook leakage " answer. But in several computer stores, reporters electric pen random sample testing machine , electric pen are not red.