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  • Interesting. The USB chip is Amtel AT MEGA16U2. I've tried on a completely different system (macbook air which also was working before today) and it didn't make a difference. Commented Sep 13, 2015 at 21:46
  • Solved: It was the cable. Commented Sep 13, 2015 at 21:52
  • The 16U2 was used on the R2 - they upgraded to the 32U4 for the R3 IIRC. Commented Sep 13, 2015 at 21:56
  • +1 for guessing it was the cable, Makenko. I just want to comment that I found some USB cables (eg. to a USB light or fan) do not have data wires. That is, to save money, they only use two wires, which carry the 5V power and ground, and omit the A/B data wires. Naturally such cables do not work as data cables, and therefore plugging into a PC using one achieves nothing. Commented Sep 13, 2015 at 22:06
  • @NickGammon It wasn't a guess - just weighing up the balance of probability - probably skewed slightly in (dis)favour of Windows failing, but that's personal bias... Commented Sep 13, 2015 at 22:40