from amazon q&a per your request. thank you ...
"got one for xmas. became "erratic" when i deprived it 9V, while 5.5V uno attached. any way to reset back to factory? it's dead. no pwr light at all."
after first setup it worked fine. i had headphones connected that came with a tv/cd player/don't remember? loaded LightSwitch sketch. then, even though i knew better having read the user's manual, i forgot and unplugged the 9v battery pack before the uno usb connection. that made it act flaky. e.g. had to load sketch multiple times to get it to work, or quick hit on the movi or uno reset button, both. unpredictable response from movi.
what i did next is what may have killed it. knowing that error messages are sent to speaker out, i replaced the headphones with a pair of powered speakers from an hp desktop to get louder output. albeit louder all i heard was a couple of garbled words, followed by dead, as in no more power light - never. all i get is a couple of flickers on the pin 13 led, then nothing.
what i tried: (i started the debug with the speakers, then i reconnecting the headphones and did this again)
1. the long reset button.
2. added trace messages to the sketch and found init() was not returning.
3. changed init() to init(false). init, in fact, returned but still no power light.
4. added isReady() at the return. looped forever.
5. added factoryDefault() before (and subsequently after) init()
btw, uno has ioref. jumpers from factory were in the correct positions. sd card securely seated.
also, unfortunately i'm not on linux, mac os x, or windows "1703" (or even windows 10).
willing to try whatever you suggest.
thanks in advance,
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