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What do you mean by direct test? Can you please provide any guidance? I am really surprised that the USB port can cause such big problem to such an expensive machine.

Hi Friends, I have an iMac, which customer says made a boom sound, and never turned on; board show no diagnostics lights. I inspected the board and it seems the 3rd USB port from left (looking at the back), had some issue, resulting in burn out of: 1. L4702 (dual filter) that carries the P and...