I just replaced my RAMPS 1.4 with a new RAMBo board to allow more inputs for thermistors and fans. However, nothing is detected when I attach the USB drive, regardless of if the 12V power supply is on or off. It is not a driver problem yet, just the fact that the board won't power up. I'm using a voltmeter to try to debug but wondering if I am just missing something simple.
Thanks for your help,
Joe
