I have a powerbook g4 but it keeps shocking me. why is that?

I have a powerbook G4 15 inch 1.25 hertz (i believe) and when i sit it down somewhere like on my desk after a while it starts to shock me. It's not like just a little bit no a lot and it hurts a lot. What could be making it do that? i need it for work and i don't have the money to buy a new one. What can i do?

It is a well-known "feature".
I suppose one might ground the metal frame, but it's quite an overkill
Not many other solutions, all power supplies I have seen for powerbook (and macbookpro which have same "feature") don't have ground. Well, one could also use a metal desk and ground the desk, but that's even more of an overkill
You are right, it's annoying, distracting, and sometimes painful.

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