I am rebuilding the electronics for an old Reprap with a RAMPS 1.4 setup.
If I plug in just the Arduino/RAMPS board into either 12 V or USB then it starts up fine, I can see this when I have the screen plugged in. However, when I start to add driver boards, the screen begins to dim. After I have three boards plugged in the power starts to drop to the point that the Arduino powers off and restarts, even when the screen is not plugged in. I have had this problem with two sets of RAMPS boards and Arduinos and with a combination of 7 different driver boards plugged into different combinations of location.
Has anyone else had any similar issues or have an idea of what might be going on? Any ideas are welcome, I am just about at my wits end with this.