The subject says it all. I can't remember what I was doing but now I have to Arduino Unos that once plugged in, the LEDs don't flash and all I get is this:
avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
I have done many, many Google searches for this problem and most results offer the same advice. I follow the steps exactly and nothing works.
I'm on a Mac Running El Capitan 10.11.3 and to be honest, this OS release has caused more headaches in my life than any other Mac update. I have dfu-programmer-0.7.2 installed, I use homebrew, libusb is installed and when I check the system profiler I get this:
Product ID: 0x0001 Vendor ID: 0x2341 Version: 0.01 Serial Number: 85431303636351417182 Speed: Up to 12 Mb/sec Manufacturer: Arduino (www.arduino.cc) Location ID: 0x14100000 / 20 Current Available (mA): 1000 Current Required (mA): 100 Extra Operating Current (mA): 0
after flashing the atmega16u2. Trying to upload a sketch results in the previous code message.
This is my first post asking for help, I hope the formatting is appropriate and I'm sure I'm missing details that you guys need to help troubleshoot.
The fact that I did this to two boards, weeks apart, is a pretty good indicator that the problem exists between the chair and the keyboard.