After uploading marlin firmware to my mega board, I plugged my ramps 1.4 in and added power to the ramps and the unit doesn't seem able to communicate with my Mac. After uploading marlin, I did test the just the mega with pronterface and everything was connecting and communicating well, but after attaching ramps there's no more connection. I checked my power supply(atx stolen from an old pc I had), and power is there so I'm at a loss as to where things are going wrong.
Any ideas on where the problem may lay?
Any ideas on where the problem may lay?