Checking the schematic, the TX/RX leds are driven directly by the atmega16u and are not connected to the TX/RX lines of the 328p. That would seem to indicate the 16u has a problem so it's a good place to double check. The lines that run to the TX/RX of the 328p run from pins 8 - 9 of the 16u. I assume that this ran previous to the fatal 'surgery'? I don't suppose you loaded something simple, like the led flash program before surgery? Just curious, are you hard wiring it to something?
Jack Wilborn
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