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Hi hastla

Here is an image of the screw i am talking about.
http://s9.postimg.org/trp8sj7j3/As_s_CNCOu5u7_Ox_Ua_Ni4k_Ol_Avcx_Fi_HOPr_VGq_DE17j_FC_p.jpg

Measure the ground of your PSU against the ground of the USB connector in the breakout board with a Voltmeter, if you found a short circuit, then you have the same problem with your 3d printer.

BR
Francisco