There's a good chance the failure is in the serial transceiver. as this is the part that would likely be damaged by external electrical overload. Take the computer apart and use an oscilloscope to see if signals are making is across the transceiver.
You can replace the serial transceiver if you know how to do surface mount device rework.
Paul
You may think I am naive.... but how can I recognize the serial transceiver?
I am quite good at soldiering and just in case a friend of mine can help.
Ben
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