Step 1:

Your power supply should be at least 12V 5A (unless you are going to get a heated bed). Wire up your power cord, L and N get positive and negative, either way. Please connect a ground to be safe. Unless you are using the outputs on the ramps board you only need 1 set of 12v wires.

If you aren’t planning on heating anything up a wall wart style power supply would work great.

Double check the power supply, it should be set to 12v ±.5v.IMG_20150418_093850