Micro not detected, can't reset
This is probably way to late, but with newer editions of the Micro you have to "double-press" the reset (input).

I have had some experiences today where playing with low-power modes that shuts down the usb interface, and the only way I got it back was activating the reset input twice fast, and then uploading a new scetch (this time with a 10sec delay before any usb-chaning stuff takes place!)

Richard