I have an Arduino Leonardo board that I have been successfully programming, on Windows 7 using IDE 1.6.4. but suddenly it is no longer recognized. It does not appear as a device in the computer device manager and it does not show up as available on a port, any port! The green "power" light comes on and the bootloader makes the "L" light blink after the board is reset, but no communication is possible thru Rx/Tx. I had been using pins 0-5 as outputs to LED's, pins 6-7 as outputs to drive solenoids, pins 8-12 as inputs from switches. Circuit driving the solenoids included diodes for back-emf from the solenoids. It had been "working", but I needed to make a small tweek and now I can no longer see the board, even with all other stuff stripped off the Leonardo board. What went wrong? It still runs the program I have loaded, but I cannot get the Rx/Tx lights to blink.
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