Hi! I'm failing to get an ATMEGA32U4-AU be detected by my OS. My windows doesn't detect anything at all, it's just silent. Same on Macintosh. Here is the circuit:
Voltage is fine, as far as I've checked several VCC pads in the circuit. And on D+ I've measured 1.37v, and on D- 0v. I guess this is fine too.
Can You give me a hint how to proceed with troubleshooting?