I am using a 24 PIN 875W PSU (Dell H875EF-00) for some experiments. PINs are like here (Version 2.0):

[![enter image description here](https://i.stack.imgur.com/fQfhw.gif)](https://i.stack.imgur.com/fQfhw.gif)

I am using the +12V1 DC from PIN 10 and some COM ground (I dont remember which ground is used for the halogen light and which one is used for the Arduino after cutting and resoldering them). +5VSB is connecto to VIN of an Arduino, another COM is GND for Arduino and PS\_ON is shorted to a GND of the Arduino.

I am using the +12V1 DC on a Philips H7 halogen light that is 12V 55W. According to the PSU label the 12V connectors can handle up to 18A, so no issues there. I have fixed the +12V to the halogen light. When I make contact with one of the COMs it lights up neatly and all the other components attached to the PSU work as desired. When I remove the jumper cable that connects the COM to the ground of the halogen light the PSU resets (clicking noise of the relais). Standby power still works (nothing happens to the arduino) but for example the R-PI connected to the 5V active supply also resets.

Am I supposed to "switch" the "live" wire for the halogen light? I was under the impression that for DC that does not matter. It is not over current as the light shines until I disconnect the ground from it, even for several seconds. To reiterate: **The PSU resets when 12V load/ground is disconnected**

Does anyone know why this happens?

Connections:
[![enter image description here](https://i.stack.imgur.com/XFpfl.png)](https://i.stack.imgur.com/XFpfl.png)

* Switch connected --> Light on
* Switch disconnected (after connected) --> Light off, but PSU resets