I connected two 9V 400mA outputs from the Voodoolab Mondo power supply in parallel using a center-positive adapter to connect to the POG big box. The final output is 18V 400mA with a 2.5mm center-positive connector. When I turn on the POG after connecting it, it briefly turns on and then turns off again. If I leave it connected for about a minute, the POG works normally. However, there is heat generated near the power connection part of the POG. It’s warm to the touch. I wonder if this is a normal state for my POG.