Uno R3 not displaying at all in device manager

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hi,

i have uno r3. couple of weeks ago working fine, , while attempting run bunch of motors through driver board, stopped functioning correctly.

the usbmodem port no longer listed in ide, , checking apple system profiler (and device manager on windows) showed no device connected @ all.

i thought maybe 16u2 chip had somehow become corrupted, after few different methods tried reflash it.

i used method https://www.sparkfun.com/tutorials/200 flash hex file https://github.com/arduino/arduino/blob/master/hardware/arduino/firmwares/atmegaxxu2/arduino-usbserial/arduino-usbserial-atmega16u2-uno-rev3.hex 16u2 (with avrdude on mac).


the write apparently successful, avrdude threw no errors , finished
code: [select]
avrdude: verifying ...
avrdude: 4034 bytes of flash verified

avrdude: safemode: lfuse reads ef
avrdude: safemode: hfuse reads d9
avrdude: safemode: efuse reads f4
avrdude: safemode: fuses ok

avrdude done.  thank you.

but board still doesn't show @ (lights etc. seem fine). other ideas?

josh



Arduino Forum > Using Arduino > Installation & Troubleshooting > Uno R3 not displaying at all in device manager


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