As the title says, surge protectors cause current to flow in USB ports, the ethernet port, etc. When I tried to insert a disc in my external disc drive I touched the metal part in the middle (the spinning part) and got shocked. So I tried connecting my computer directly to the outlet and the problem was fixed. I bought another surge protector and the problem persists. WTF? The very irony though.. Can anyone explain why this is happening? Thank you in advance.